diff --git a/index.php b/index.php
index dc3dc80f6..6ab405c63 100644
--- a/index.php
+++ b/index.php
@@ -46,7 +46,7 @@ if ($a->isMaxProcessesReached() || $a->isMaxLoadReached()) {
 	System::httpExit(503, ['title' => 'Error 503 - Service Temporarily Unavailable', 'description' => 'System is currently overloaded. Please try again later.']);
 }
 
-if (strstr($a->query_string, '.well-known/host-meta') and ($a->query_string != '.well-known/host-meta')) {
+if (strstr($a->query_string, '.well-known/host-meta') && ($a->query_string != '.well-known/host-meta')) {
 	System::httpExit(404);
 }
 
diff --git a/mod/crepair.php b/mod/crepair.php
index 076c611db..d8c6b35f5 100644
--- a/mod/crepair.php
+++ b/mod/crepair.php
@@ -133,7 +133,7 @@ function crepair_content(App $a)
 		$remote_self_options = ['0' => L10n::t('No mirroring'), '2' => L10n::t('Mirror as my own posting')];
 	}
 
-	$update_profile = in_array($contact['network'], [Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS]);
+	$update_profile = in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS]);
 
 	$tab_str = contacts_tab($a, $contact, 5);
 
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 166530f47..d77a0277f 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -212,8 +212,13 @@ class Processor
 		$item['content-warning'] = HTML::toBBCode($activity['summary']);
 		$item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
 		$item['location'] = $activity['location'];
+
+		if (!empty($item['latitude']) && !empty($item['longitude'])) {
+			$item['coord'] = $item['latitude'] . ' ' . $item['longitude'];
+		}
+
 		$item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
-		$item['app'] = $activity['service'];
+		$item['app'] = $activity['generator'];
 		$item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
 		$item['diaspora_signed_text'] = defaults($activity, 'diaspora:comment', '');
 
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index f54503708..cde197b0c 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -513,24 +513,15 @@ class Receiver
 	private static function addActivityFields($object_data, $activity)
 	{
 		if (!empty($activity['published']) && empty($object_data['published'])) {
-			$object_data['published'] = JsonLD::fetchElement($activity, 'published', '@value');
-		}
-
-		if (!empty($activity['updated']) && empty($object_data['updated'])) {
-			$object_data['updated'] = JsonLD::fetchElement($activity, 'updated', '@value');
+			$object_data['published'] = JsonLD::fetchElement($activity, 'as:published', '@value');
 		}
 
 		if (!empty($activity['diaspora:guid']) && empty($object_data['diaspora:guid'])) {
 			$object_data['diaspora:guid'] = JsonLD::fetchElement($activity, 'diaspora:guid');
 		}
 
-		if (!empty($activity['inReplyTo']) && empty($object_data['parent-uri'])) {
-			$object_data['parent-uri'] = JsonLD::fetchElement($activity, 'inReplyTo');
-		}
+		$object_data['service'] = JsonLD::fetchElement($activity, 'as:instrument', 'as:name', '@type', 'as:Service');
 
-		if (!empty($activity['instrument'])) {
-			$object_data['service'] = JsonLD::fetchElement($activity, 'instrument', 'name', 'type', 'Service');
-		}
 		return $object_data;
 	}
 
@@ -696,10 +687,13 @@ class Receiver
 		$object_data['content'] = JsonLD::fetchElement($object, 'as:content');
 		$object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/bbcode');
 		$object_data['location'] = JsonLD::fetchElement($object, 'as:location', 'as:name', '@type', 'as:Place');
+		$object_data['latitude'] = JsonLD::fetchElement($object, 'as:location', 'as:latitude', '@type', 'as:Place');
+		$object_data['latitude'] = JsonLD::fetchElement($object_data, 'latitude', '@value');
+		$object_data['longitude'] = JsonLD::fetchElement($object, 'as:location', 'as:longitude', '@type', 'as:Place');
+		$object_data['longitude'] = JsonLD::fetchElement($object_data, 'longitude', '@value');
 		$object_data['attachments'] = self::processAttachments(JsonLD::fetchElementArray($object, 'as:attachment'));
 		$object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag'));
-//		$object_data['service'] = JsonLD::fetchElement($object, 'instrument', 'name', 'type', 'Service'); // todo
-		$object_data['service'] = null;
+		$object_data['generator'] = JsonLD::fetchElement($object, 'as:generator', 'as:name', '@type', 'as:Application');
 		$object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url');
 
 		// Special treatment for Hubzilla links
@@ -719,7 +713,7 @@ class Receiver
 		// @context, type, actor, signature, mediaType, duration, replies, icon
 
 		// Also missing: (Defined in the standard, but currently unused)
-		// audience, preview, endTime, startTime, generator, image
+		// audience, preview, endTime, startTime, image
 
 		// Data in Notes:
 
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 96c069e58..b261e6060 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -4,6 +4,7 @@
  */
 namespace Friendica\Protocol\ActivityPub;
 
+use Friendica\BaseObject;
 use Friendica\Database\DBA;
 use Friendica\Core\System;
 use Friendica\Util\HTTPSignature;
@@ -22,22 +23,21 @@ use Friendica\Model\Profile;
 use Friendica\Core\Config;
 use Friendica\Object\Image;
 use Friendica\Protocol\ActivityPub;
+use Friendica\Protocol\Diaspora;
 use Friendica\Core\Cache;
+use Friendica\Util\Map;
+
+require_once 'include/api.php';
 
 /**
  * @brief ActivityPub Transmitter Protocol class
  *
  * To-Do:
  *
- * Missing object fields:
- * - service (App)
- * - location
- *
  * Missing object types:
  * - Event
  *
  * Complicated object types:
- * - Announce
  * - Undo Announce
  *
  * General:
@@ -327,7 +327,7 @@ class Transmitter
 			foreach ($terms as $term) {
 				$profile = APContact::getByURL($term['url'], false);
 				if (!empty($profile) && empty($contacts[$profile['url']])) {
-					$data['cc'][] = $profile['url'];
+					$data['to'][] = $profile['url'];
 					$contacts[$profile['url']] = $profile['url'];
 				}
 			}
@@ -379,11 +379,6 @@ class Transmitter
 		}
 		DBA::close($parents);
 
-		if (empty($data['to'])) {
-			$data['to'] = $data['cc'];
-			$data['cc'] = [];
-		}
-
 		return $data;
 	}
 
@@ -467,7 +462,9 @@ class Transmitter
 	 */
 	private static function getTypeOfItem($item)
 	{
-		if ($item['verb'] == ACTIVITY_POST) {
+		if (!empty(Diaspora::isReshare($item['body'], false))) {
+			$type = 'Announce';
+		} elseif ($item['verb'] == ACTIVITY_POST) {
 			if ($item['created'] == $item['edited']) {
 				$type = 'Create';
 			} else {
@@ -556,10 +553,14 @@ class Transmitter
 
 		$data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 
+		$data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
+
 		$data = array_merge($data, self::createPermissionBlockForItem($item));
 
-		if (in_array($data['type'], ['Create', 'Update', 'Announce', 'Delete'])) {
+		if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 			$data['object'] = self::createNote($item);
+		} elseif ($data['type'] == 'Announce') {
+			$data['object'] = self::createAnnounce($item);
 		} elseif ($data['type'] == 'Undo') {
 			$data['object'] = self::createActivityFromItem($item_id, true);
 		} else {
@@ -599,6 +600,40 @@ class Transmitter
 		return $data;
 	}
 
+	/**
+	 * Creates a location entry for a given item array
+	 *
+	 * @param array $item
+	 *
+	 * @return array with location array
+	 */
+	private static function createLocation($item)
+	{
+		$location = ['type' => 'Place'];
+
+		if (!empty($item['location'])) {
+			$location['name'] = $item['location'];
+		}
+
+		$coord = [];
+
+		if (empty($item['coord'])) {
+			$coord = Map::getCoordinates($item['location']);
+		} else {
+			$coords = explode(' ', $item['coord']);
+			if (count($coords) == 2) {
+				$coord = ['lat' => $coords[0], 'lon' => $coords[1]];
+			}
+		}
+
+		if (!empty($coord['lat']) && !empty($coord['lon'])) {
+			$location['latitude'] = $coord['lat'];
+			$location['longitude'] = $coord['lon'];
+		}
+
+		return $location;
+	}
+
 	/**
 	 * Returns a tag array for a given item array
 	 *
@@ -800,11 +835,37 @@ class Transmitter
 
 		$data['attachment'] = self::createAttachmentList($item, $type);
 		$data['tag'] = self::createTagList($item);
+
+		if (!empty($item['coord']) || !empty($item['location'])) {
+			$data['location'] = self::createLocation($item);
+		}
+
+		if (!empty($item['app'])) {
+			$data['generator'] = ['type' => 'Application', 'name' => $item['app']];
+		}
+
 		$data = array_merge($data, self::createPermissionBlockForItem($item));
 
 		return $data;
 	}
 
+	/**
+	 * Creates an announce object entry
+	 *
+	 * @param array $item
+	 *
+	 * @return string with announced object url
+	 */
+	public static function createAnnounce($item)
+	{
+		$announce = api_share_as_retweet($item);
+		if (empty($announce['plink'])) {
+			return self::createNote($item);
+		}
+
+		return $announce['plink'];
+	}
+
 	/**
 	 * Transmits a contact suggestion to a given inbox
 	 *
@@ -825,7 +886,7 @@ class Transmitter
 			'actor' => $owner['url'],
 			'object' => $suggestion['url'],
 			'content' => $suggestion['note'],
-			'published' => DateTimeFormat::utc($suggestion['created'] . '+00:00', DateTimeFormat::ATOM),
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => [ActivityPub::PUBLIC_COLLECTION],
 			'cc' => []];
 
@@ -852,6 +913,7 @@ class Transmitter
 			'actor' => $owner['url'],
 			'object' => $owner['url'],
 			'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => [ActivityPub::PUBLIC_COLLECTION],
 			'cc' => []];
 
@@ -878,6 +940,7 @@ class Transmitter
 			'actor' => $owner['url'],
 			'object' => self::getProfile($uid),
 			'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => [$profile['followers']],
 			'cc' => []];
 
@@ -905,6 +968,7 @@ class Transmitter
 			'type' => $activity,
 			'actor' => $owner['url'],
 			'object' => $profile['url'],
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => $profile['url']];
 
 		logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
@@ -932,6 +996,7 @@ class Transmitter
 			'object' => ['id' => $id, 'type' => 'Follow',
 				'actor' => $profile['url'],
 				'object' => $owner['url']],
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => $profile['url']];
 
 		logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
@@ -959,6 +1024,7 @@ class Transmitter
 			'object' => ['id' => $id, 'type' => 'Follow',
 				'actor' => $profile['url'],
 				'object' => $owner['url']],
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => $profile['url']];
 
 		logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
@@ -987,6 +1053,7 @@ class Transmitter
 			'object' => ['id' => $id, 'type' => 'Follow',
 				'actor' => $owner['url'],
 				'object' => $profile['url']],
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 			'to' => $profile['url']];
 
 		logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);