diff --git a/include/api.php b/include/api.php
index 5510eddb4f..8588b2cf89 100644
--- a/include/api.php
+++ b/include/api.php
@@ -3629,6 +3629,84 @@ function api_direct_messages_destroy($type)
 /// @TODO move to top of file or somewhere better
 api_register_func('api/direct_messages/destroy', 'api_direct_messages_destroy', true, API_METHOD_DELETE);
 
+/**
+ * Unfollow Contact
+ *
+ * @brief unfollow contact 
+ *
+ * @param string $type Known types are 'atom', 'rss', 'xml' and 'json'
+ * @return string|array
+ * @see https://developer.twitter.com/en/docs/accounts-and-users/follow-search-get-users/api-reference/post-friendships-destroy.html
+ */
+function api_friendships_destroy($type)
+{
+	$uid = api_user();
+
+	if ($uid === false) {
+		throw new ForbiddenException();
+	}
+
+	$contact_id = defaults($_REQUEST, 'user_id');
+
+	if (empty($contact_id)) {
+		logger("No user_id specified", LOGGER_DEBUG);
+		throw new BadRequestException("no user_id specified");
+	}
+
+	// Get Contact by given id
+	$contact = DBA::selectFirst('contact', ['url'], ['id' => $contact_id, 'uid' => 0, 'self' => false]);
+
+	if(!DBA::isResult($contact)) {
+		logger("No contact found for ID" . $contact_id, LOGGER_DEBUG);
+		throw new NotFoundException("no contact found to given ID");
+	}
+
+	$url = $contact["url"];
+
+	$condition = ["`uid` = ? AND (`rel` = ? OR `rel` = ?) AND (`nurl` = ? OR `alias` = ? OR `alias` = ?)",
+			$uid, Contact::SHARING, Contact::FRIEND, normalise_link($url),
+			normalise_link($url), $url];
+	$contact = DBA::selectFirst('contact', [], $condition);
+
+	if (!DBA::isResult($contact)) {
+		logger("Not following Contact", LOGGER_DEBUG);
+		throw new NotFoundException("Not following Contact");
+	}
+
+	if (!in_array($contact['network'], Protocol::NATIVE_SUPPORT)) {
+		logger("Not supported", LOGGER_DEBUG);
+		throw new ExpectationFailedException("Not supported");
+	}
+
+	$dissolve = ($contact['rel'] == Contact::SHARING);
+
+	$owner = User::getOwnerDataById($uid);
+	if ($owner) {
+		Contact::terminateFriendship($owner, $contact, $dissolve);
+	}
+	else {
+		logger("No owner found", LOGGER_DEBUG);
+		throw new NotFoundException("Error Processing Request");
+	}
+
+	// Sharing-only contacts get deleted as there no relationship any more
+	if ($dissolve) {
+		Contact::remove($contact['id']);
+	} else {
+		DBA::update('contact', ['rel' => Contact::FOLLOWER], ['id' => $contact['id']]);
+	}
+
+	// "uid" and "self" are only needed for some internal stuff, so remove it from here
+	unset($contact["uid"]);
+	unset($contact["self"]);
+
+	// Set screen_name since Twidere requests it
+	$contact["screen_name"] = $contact["nick"];
+
+	return api_format_data("friendships-destroy", $type, ['user' => $contact]);
+}
+api_register_func('api/friendships/destroy', 'api_friendships_destroy', true, API_METHOD_POST);
+
 /**
  *
  * @param string $type Return type (atom, rss, xml, json)