diff --git a/config/dbstructure.config.php b/config/dbstructure.config.php
index 3996205db0..86965a2019 100755
--- a/config/dbstructure.config.php
+++ b/config/dbstructure.config.php
@@ -34,7 +34,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1310);
+	define('DB_UPDATE_VERSION', 1311);
 }
 
 return [
@@ -74,6 +74,7 @@ return [
 			"alias" => ["type" => "varchar(255)", "comment" => ""],
 			"pubkey" => ["type" => "text", "comment" => ""],
 			"baseurl" => ["type" => "varchar(255)", "comment" => "baseurl of the ap contact"],
+			"generator" => ["type" => "varchar(255)", "comment" => "Name of the contact's system"],
 			"updated" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => ""]
 		],
 		"indexes" => [
@@ -185,7 +186,8 @@ return [
 			"remote_self" => ["type" => "boolean", "not null" => "1", "default" => "0", "comment" => ""],
 			"rel" => ["type" => "tinyint unsigned", "not null" => "1", "default" => "0", "comment" => "The kind of the relation between the user and the contact"],
 			"duplex" => ["type" => "boolean", "not null" => "1", "default" => "0", "comment" => ""],
-			"network" => ["type" => "char(4)", "not null" => "1", "default" => "", "comment" => "Network protocol of the contact"],
+			"network" => ["type" => "char(4)", "not null" => "1", "default" => "", "comment" => "Network of the contact"],
+			"protocol" => ["type" => "char(4)", "not null" => "1", "default" => "", "comment" => "Protocol of the contact"],
 			"name" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "Name that this contact is known by"],
 			"nick" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "Nick- and user name of the contact"],
 			"location" => ["type" => "varchar(255)", "default" => "", "comment" => ""],
diff --git a/database.sql b/database.sql
index b9e70097ee..62c91262c0 100644
--- a/database.sql
+++ b/database.sql
@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2019.06-dev (Dalmatian Bellflower)
--- DB_UPDATE_VERSION 1310
+-- DB_UPDATE_VERSION 1311
 -- ------------------------------------------
 
 
@@ -40,6 +40,7 @@ CREATE TABLE IF NOT EXISTS `apcontact` (
 	`alias` varchar(255) COMMENT '',
 	`pubkey` text COMMENT '',
 	`baseurl` varchar(255) COMMENT 'baseurl of the ap contact',
+	`generator` varchar(255) COMMENT 'Name of the contact\'s system',
 	`updated` datetime NOT NULL DEFAULT '0001-01-01 00:00:00' COMMENT '',
 	 PRIMARY KEY(`url`),
 	 INDEX `addr` (`addr`(32)),
diff --git a/mod/follow.php b/mod/follow.php
index ba4ff35f19..48e621f4af 100644
--- a/mod/follow.php
+++ b/mod/follow.php
@@ -91,32 +91,34 @@ function follow_content(App $a)
 
 	$ret = Probe::uri($url);
 
-	if (($ret['network'] == Protocol::DIASPORA) && !Config::get('system', 'diaspora_enabled')) {
+	$protocol = Contact::getProtocol($ret['url'], $ret['network']);
+
+	if (($protocol == Protocol::DIASPORA) && !Config::get('system', 'diaspora_enabled')) {
 		notice(L10n::t("Diaspora support isn't enabled. Contact can't be added."));
 		$submit = '';
 		//$a->internalRedirect($_SESSION['return_path']);
 		// NOTREACHED
 	}
 
-	if (($ret['network'] == Protocol::OSTATUS) && Config::get('system', 'ostatus_disabled')) {
+	if (($protocol == Protocol::OSTATUS) && Config::get('system', 'ostatus_disabled')) {
 		notice(L10n::t("OStatus support is disabled. Contact can't be added."));
 		$submit = '';
 		//$a->internalRedirect($_SESSION['return_path']);
 		// NOTREACHED
 	}
 
-	if ($ret['network'] == Protocol::PHANTOM) {
+	if ($protocol == Protocol::PHANTOM) {
 		notice(L10n::t("The network type couldn't be detected. Contact can't be added."));
 		$submit = '';
 		//$a->internalRedirect($_SESSION['return_path']);
 		// NOTREACHED
 	}
 
-	if ($ret['network'] == Protocol::MAIL) {
+	if ($protocol == Protocol::MAIL) {
 		$ret['url'] = $ret['addr'];
 	}
 
-	if (($ret['network'] === Protocol::DFRN) && !DBA::isResult($r)) {
+	if (($protocol === Protocol::DFRN) && !DBA::isResult($r)) {
 		$request = $ret['request'];
 		$tpl = Renderer::getMarkupTemplate('dfrn_request.tpl');
 	} else {
@@ -147,7 +149,7 @@ function follow_content(App $a)
 		$gcontact_id = $r[0]['id'];
 	}
 
-	if ($ret['network'] === Protocol::DIASPORA) {
+	if ($protocol === Protocol::DIASPORA) {
 		$r[0]['location'] = '';
 		$r[0]['about'] = '';
 	}
diff --git a/src/Model/APContact.php b/src/Model/APContact.php
index 47bbe7d59f..cf1f9b7231 100644
--- a/src/Model/APContact.php
+++ b/src/Model/APContact.php
@@ -167,10 +167,15 @@ class APContact extends BaseObject
 
 		$apcontact['manually-approve'] = (int)JsonLD::fetchElement($compacted, 'as:manuallyApprovesFollowers');
 
+		if (!empty($compacted['as:generator'])) {
+			$apcontact['baseurl'] = JsonLD::fetchElement($compacted['as:generator'], 'as:url', '@id');
+			$apcontact['generator'] = JsonLD::fetchElement($compacted['as:generator'], 'as:name', '@value');
+		}
+
 		// To-Do
 
 		// Unhandled
-		// @context, tag, attachment, image, nomadicLocations, signature, following, followers, featured, movedTo, liked
+		// tag, attachment, image, nomadicLocations, signature, featured, movedTo, liked
 
 		// Unhandled from Misskey
 		// sharedInbox, isCat
@@ -185,6 +190,9 @@ class APContact extends BaseObject
 			$apcontact['baseurl'] = Network::unparseURL($parts);
 		} else {
 			$apcontact['addr'] = null;
+		}
+
+		if (empty($apcontact['baseurl'])) {
 			$apcontact['baseurl'] = null;
 		}
 
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 85d1bfe9ad..ee1eb20c22 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -653,9 +653,15 @@ class Contact extends BaseObject
 		if (empty($contact['network'])) {
 			return;
 		}
-		if (($contact['network'] == Protocol::DFRN) && $dissolve) {
+
+		$protocol = $contact['network'];
+		if (($protocol == Protocol::DFRN) && !self::isLegacyDFRNContact($contact)) {
+			$protocol = Protocol::ACTIVITYPUB;
+		}
+
+		if (($protocol == Protocol::DFRN) && $dissolve) {
 			DFRN::deliver($user, $contact, 'placeholder', true);
-		} elseif (in_array($contact['network'], [Protocol::OSTATUS, Protocol::DFRN])) {
+		} elseif (in_array($protocol, [Protocol::OSTATUS, Protocol::DFRN])) {
 			// create an unfollow slap
 			$item = [];
 			$item['verb'] = NAMESPACE_OSTATUS . "/unfollow";
@@ -670,9 +676,9 @@ class Contact extends BaseObject
 			if (!empty($contact['notify'])) {
 				Salmon::slapper($user, $contact['notify'], $slap);
 			}
-		} elseif ($contact['network'] == Protocol::DIASPORA) {
+		} elseif ($protocol == Protocol::DIASPORA) {
 			Diaspora::sendUnshare($user, $contact);
-		} elseif ($contact['network'] == Protocol::ACTIVITYPUB) {
+		} elseif ($protocol == Protocol::ACTIVITYPUB) {
 			ActivityPub\Transmitter::sendContactUndo($contact['url'], $contact['id'], $user['uid']);
 
 			if ($dissolve) {
@@ -1338,6 +1344,7 @@ class Contact extends BaseObject
 				'location'  => defaults($data, 'location', ''),
 				'about'     => defaults($data, 'about', ''),
 				'network'   => $data['network'],
+				'protocol'  => self::getProtocol($data['url'], $data['network']),
 				'pubkey'    => defaults($data, 'pubkey', ''),
 				'rel'       => self::SHARING,
 				'priority'  => defaults($data, 'priority', 0),
@@ -1398,7 +1405,7 @@ class Contact extends BaseObject
 			self::updateAvatar($data['photo'], $uid, $contact_id);
 		}
 
-		$fields = ['url', 'nurl', 'addr', 'alias', 'name', 'nick', 'keywords', 'location', 'about', 'avatar-date', 'pubkey'];
+		$fields = ['url', 'nurl', 'addr', 'alias', 'name', 'nick', 'keywords', 'location', 'about', 'avatar-date', 'pubkey', 'protocol'];
 		$contact = DBA::selectFirst('contact', $fields, ['id' => $contact_id]);
 
 		// This condition should always be true
@@ -1411,7 +1418,8 @@ class Contact extends BaseObject
 			'url' => $data['url'],
 			'nurl' => Strings::normaliseLink($data['url']),
 			'name' => $data['name'],
-			'nick' => $data['nick']];
+			'nick' => $data['nick'],
+			'protocol' => self::getProtocol($data['url'], $data['network'])];
 
 		if (!empty($data['keywords'])) {
 			$updated['keywords'] = $data['keywords'];
@@ -1768,6 +1776,40 @@ class Contact extends BaseObject
 		return true;
 	}
 
+	/**
+	 * Detects if a given contact array belongs to a legacy DFRN connection
+	 *
+	 * @param array $contact
+	 * @return boolean
+	 */
+	private static function isLegacyDFRNContact($contact)
+	{
+		// Newer Friendica contacts are connected via AP, then these fields aren't set
+		return !empty($contact['dfrn-id']) || !empty($contact['issued-id']);
+	}
+
+	/**
+	 * Detects the communication protocol for a given contact url.
+	 * This is used to detect Friendica contacts that we can communicate via AP.
+	 *
+	 * @param string $url contact url
+	 * @param string $network Network of that contact
+	 * @return string with protocol
+	 */
+	public static function getProtocol($url, $network)
+	{
+		if ($network != Protocol::DFRN) {
+			return $network;
+		}
+
+		$apcontact = APContact::getByURL($url);
+		if (!empty($apcontact) && !empty($apcontact['generator'])) {
+			return Protocol::ACTIVITYPUB;
+		} else {
+			return $network;
+		}
+	}
+
 	/**
 	 * Takes a $uid and a url/handle and adds a new contact
 	 * Currently if the contact is DFRN, interactive needs to be true, to redirect to the
@@ -1843,7 +1885,9 @@ class Contact extends BaseObject
 			$contact = DBA::selectFirst('contact', ['id', 'rel'], $condition);
 		}
 
-		if (($ret['network'] === Protocol::DFRN) && !DBA::isResult($contact)) {
+		$protocol = self::getProtocol($url, $ret['network']);
+
+		if (($protocol === Protocol::DFRN) && !DBA::isResult($contact)) {
 			if ($interactive) {
 				if (strlen($a->getURLPath())) {
 					$myaddr = bin2hex(System::baseUrl() . '/profile/' . $a->user['nickname']);
@@ -1862,7 +1906,7 @@ class Contact extends BaseObject
 		}
 
 		// This extra param just confuses things, remove it
-		if ($ret['network'] === Protocol::DIASPORA) {
+		if ($protocol === Protocol::DIASPORA) {
 			$ret['url'] = str_replace('?absolute=true', '', $ret['url']);
 		}
 
@@ -1885,7 +1929,7 @@ class Contact extends BaseObject
 			return $result;
 		}
 
-		if ($ret['network'] === Protocol::OSTATUS && Config::get('system', 'ostatus_disabled')) {
+		if ($protocol === Protocol::OSTATUS && Config::get('system', 'ostatus_disabled')) {
 			$result['message'] .= L10n::t('The profile address specified belongs to a network which has been disabled on this site.') . EOL;
 			$ret['notify'] = '';
 		}
@@ -1894,15 +1938,15 @@ class Contact extends BaseObject
 			$result['message'] .= L10n::t('Limited profile. This person will be unable to receive direct/personal notifications from you.') . EOL;
 		}
 
-		$writeable = ((($ret['network'] === Protocol::OSTATUS) && ($ret['notify'])) ? 1 : 0);
+		$writeable = ((($protocol === Protocol::OSTATUS) && ($ret['notify'])) ? 1 : 0);
 
-		$subhub = (($ret['network'] === Protocol::OSTATUS) ? true : false);
+		$subhub = (($protocol === Protocol::OSTATUS) ? true : false);
 
-		$hidden = (($ret['network'] === Protocol::MAIL) ? 1 : 0);
+		$hidden = (($protocol === Protocol::MAIL) ? 1 : 0);
 
-		$pending = in_array($ret['network'], [Protocol::ACTIVITYPUB]);
+		$pending = in_array($protocol, [Protocol::ACTIVITYPUB]);
 
-		if (in_array($ret['network'], [Protocol::MAIL, Protocol::DIASPORA, Protocol::ACTIVITYPUB])) {
+		if (in_array($protocol, [Protocol::MAIL, Protocol::DIASPORA, Protocol::ACTIVITYPUB])) {
 			$writeable = 1;
 		}
 
@@ -1913,7 +1957,7 @@ class Contact extends BaseObject
 			$fields = ['rel' => $new_relation, 'subhub' => $subhub, 'readonly' => false];
 			DBA::update('contact', $fields, ['id' => $contact['id']]);
 		} else {
-			$new_relation = (in_array($ret['network'], [Protocol::MAIL]) ? self::FRIEND : self::SHARING);
+			$new_relation = (in_array($protocol, [Protocol::MAIL]) ? self::FRIEND : self::SHARING);
 
 			// create contact record
 			DBA::insert('contact', [
@@ -1930,6 +1974,7 @@ class Contact extends BaseObject
 				'name'    => $ret['name'],
 				'nick'    => $ret['nick'],
 				'network' => $ret['network'],
+				'protocol' => $protocol,
 				'pubkey'  => $ret['pubkey'],
 				'rel'     => $new_relation,
 				'priority'=> $ret['priority'],
@@ -1963,7 +2008,7 @@ class Contact extends BaseObject
 		$owner = User::getOwnerDataById($uid);
 
 		if (DBA::isResult($owner)) {
-			if (in_array($contact['network'], [Protocol::OSTATUS, Protocol::DFRN])) {
+			if (in_array($protocol, [Protocol::OSTATUS, Protocol::DFRN])) {
 				// create a follow slap
 				$item = [];
 				$item['verb'] = ACTIVITY_FOLLOW;
@@ -1979,10 +2024,10 @@ class Contact extends BaseObject
 				if (!empty($contact['notify'])) {
 					Salmon::slapper($owner, $contact['notify'], $slap);
 				}
-			} elseif ($contact['network'] == Protocol::DIASPORA) {
+			} elseif ($protocol == Protocol::DIASPORA) {
 				$ret = Diaspora::sendShare($a->user, $contact);
 				Logger::log('share returns: ' . $ret);
-			} elseif ($contact['network'] == Protocol::ACTIVITYPUB) {
+			} elseif ($protocol == Protocol::ACTIVITYPUB) {
 				$activity_id = ActivityPub\Transmitter::activityIDFromContact($contact_id);
 				if (empty($activity_id)) {
 					// This really should never happen
@@ -2060,13 +2105,15 @@ class Contact extends BaseObject
 		$network = $pub_contact['network'];
 
 		if (is_array($contact)) {
+			$protocol = self::getProtocol($url, $contact['network']);
+
 			if (($contact['rel'] == self::SHARING)
 				|| ($sharing && $contact['rel'] == self::FOLLOWER)) {
 				DBA::update('contact', ['rel' => self::FRIEND, 'writable' => true],
 						['id' => $contact['id'], 'uid' => $importer['uid']]);
 			}
 
-			if ($contact['network'] == Protocol::ACTIVITYPUB) {
+			if ($protocol == Protocol::ACTIVITYPUB) {
 				ActivityPub\Transmitter::sendContactAccept($contact['url'], $contact['hub-verify'], $importer['uid']);
 			}
 
@@ -2077,9 +2124,9 @@ class Contact extends BaseObject
 				return;
 			}
 			// create contact record
-			q("INSERT INTO `contact` (`uid`, `created`, `url`, `nurl`, `name`, `nick`, `photo`, `network`, `rel`,
+			q("INSERT INTO `contact` (`uid`, `created`, `url`, `nurl`, `name`, `nick`, `photo`, `network`, `protocol`, `rel`,
 				`blocked`, `readonly`, `pending`, `writable`)
-				VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, 1)",
+				VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, 1)",
 				intval($importer['uid']),
 				DBA::escape(DateTimeFormat::utcNow()),
 				DBA::escape($url),
@@ -2087,6 +2134,7 @@ class Contact extends BaseObject
 				DBA::escape($name),
 				DBA::escape($nick),
 				DBA::escape($photo),
+				DBA::escape($protocol),
 				DBA::escape($network),
 				intval(self::FOLLOWER)
 			);
@@ -2140,8 +2188,9 @@ class Contact extends BaseObject
 				DBA::update('contact', ['pending' => false], $condition);
 
 				$contact = DBA::selectFirst('contact', ['url', 'network', 'hub-verify'], ['id' => $contact_record['id']]);
+				$protocol = self::getProtocol($contact['url'], $contact['network']);
 
-				if ($contact['network'] == Protocol::ACTIVITYPUB) {
+				if ($protocol == Protocol::ACTIVITYPUB) {
 					ActivityPub\Transmitter::sendContactAccept($contact['url'], $contact['hub-verify'], $importer['uid']);
 				}
 			}
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 475ccfc0b2..81790b1b70 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -456,6 +456,7 @@ class Processor
 			self::switchContact($cid);
 			DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
 			$contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
+			Logger::info('hub-verify', ['hub-verify' => $contact['hub-verify'], 'url' => $contact['url']]);
 		} else {
 			$contact = false;
 		}
@@ -474,6 +475,7 @@ class Processor
 
 		if (empty($contact)) {
 			DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
+			Logger::info('hub-verify', ['hub-verify' => $activity['id'], 'cid' => $cid]);
 		}
 
 		Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);