diff --git a/src/Model/APContact.php b/src/Model/APContact.php
index c7cf54b720..917e0895dc 100644
--- a/src/Model/APContact.php
+++ b/src/Model/APContact.php
@@ -106,6 +106,10 @@ class APContact extends BaseObject
 
 		$compacted = JsonLD::compact($data);
 
+		if (empty($compacted['@id'])) {
+			return false;
+		}
+
 		$apcontact = [];
 		$apcontact['url'] = $compacted['@id'];
 		$apcontact['uuid'] = JsonLD::fetchElement($compacted, 'diaspora:guid');
diff --git a/src/Protocol/ActivityPub.php b/src/Protocol/ActivityPub.php
index e6701074c6..107cc423a6 100644
--- a/src/Protocol/ActivityPub.php
+++ b/src/Protocol/ActivityPub.php
@@ -40,6 +40,7 @@ class ActivityPub
 	const PUBLIC_COLLECTION = 'https://www.w3.org/ns/activitystreams#Public';
 	const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 		['vcard' => 'http://www.w3.org/2006/vcard/ns#',
+		'dfrn' => 'http://purl.org/macgirvin/dfrn/1.0/',
 		'diaspora' => 'https://diasporafoundation.org/ns/',
 		'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
 		'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag']];
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index d3043c530b..64b98e17e7 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -1000,11 +1000,10 @@ class Transmitter
 	public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 	{
 		$owner = User::getOwnerDataById($uid);
-		$profile = APContact::getByURL($owner['url']);
 
 		$suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
 
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 			'type' => 'Announce',
 			'actor' => $owner['url'],
@@ -1020,6 +1019,34 @@ class Transmitter
 		return HTTPSignature::transmit($signed, $inbox, $uid);
 	}
 
+	/**
+	 * Transmits a profile relocation to a given inbox
+	 *
+	 * @param integer $uid User ID
+	 * @param string $inbox Target inbox
+	 *
+	 * @return boolean was the transmission successful?
+	 */
+	public static function sendProfileRelocation($uid, $inbox)
+	{
+		$owner = User::getOwnerDataById($uid);
+
+		$data = ['@context' => ActivityPub::CONTEXT,
+			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
+			'type' => 'dfrn:relocate',
+			'actor' => $owner['url'],
+			'object' => $owner['url'],
+			'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
+			'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
+			'to' => [ActivityPub::PUBLIC_COLLECTION],
+			'cc' => []];
+
+		$signed = LDSignature::sign($data, $owner);
+
+		Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
+		return HTTPSignature::transmit($signed, $inbox, $uid);
+	}
+
 	/**
 	 * Transmits a profile deletion to a given inbox
 	 *
@@ -1031,9 +1058,8 @@ class Transmitter
 	public static function sendProfileDeletion($uid, $inbox)
 	{
 		$owner = User::getOwnerDataById($uid);
-		$profile = APContact::getByURL($owner['url']);
 
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 			'type' => 'Delete',
 			'actor' => $owner['url'],
@@ -1062,7 +1088,7 @@ class Transmitter
 		$owner = User::getOwnerDataById($uid);
 		$profile = APContact::getByURL($owner['url']);
 
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 			'type' => 'Update',
 			'actor' => $owner['url'],
@@ -1091,7 +1117,7 @@ class Transmitter
 
 		$owner = User::getOwnerDataById($uid);
 
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 			'type' => $activity,
 			'actor' => $owner['url'],
@@ -1117,7 +1143,7 @@ class Transmitter
 		$profile = APContact::getByURL($target);
 
 		$owner = User::getOwnerDataById($uid);
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 			'type' => 'Accept',
 			'actor' => $owner['url'],
@@ -1145,7 +1171,7 @@ class Transmitter
 		$profile = APContact::getByURL($target);
 
 		$owner = User::getOwnerDataById($uid);
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 			'type' => 'Reject',
 			'actor' => $owner['url'],
@@ -1174,7 +1200,7 @@ class Transmitter
 		$id = System::baseUrl() . '/activity/' . System::createGUID();
 
 		$owner = User::getOwnerDataById($uid);
-		$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
+		$data = ['@context' => ActivityPub::CONTEXT,
 			'id' => $id,
 			'type' => 'Undo',
 			'actor' => $owner['url'],
diff --git a/src/Util/JsonLD.php b/src/Util/JsonLD.php
index feaf3e62f5..bed7a67d60 100644
--- a/src/Util/JsonLD.php
+++ b/src/Util/JsonLD.php
@@ -85,11 +85,12 @@ class JsonLD
 
 		$context = (object)['as' => 'https://www.w3.org/ns/activitystreams#',
 			'w3id' => 'https://w3id.org/security#',
+			'ldp' => (object)['@id' => 'http://www.w3.org/ns/ldp#', '@type' => '@id'],
 			'vcard' => (object)['@id' => 'http://www.w3.org/2006/vcard/ns#', '@type' => '@id'],
-			'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
+			'dfrn' => (object)['@id' => 'http://purl.org/macgirvin/dfrn/1.0/', '@type' => '@id'],
 			'diaspora' => (object)['@id' => 'https://diasporafoundation.org/ns/', '@type' => '@id'],
-			'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id'],
-			'ldp' => (object)['@id' => 'http://www.w3.org/ns/ldp#', '@type' => '@id']];
+			'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
+			'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id']];
 
 		$jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));