Diaspora "relayable_retraction" is now supported by Friendica. The following should now work: Friendica top-level post: Diaspora comment deleted, disappears in Friendica Friendica comment deleted, disappears in Diaspora Diaspora like retracted, disappears in Friendica Friendica like retracted, disappears in Diaspora Diaspora top-level post: Same There are still exceptions, however. First, Friendica and Diaspora seem to frequently reject comments with an "invalid signature" error. This can probably be fixed. Also, some comments/likes/retractions seem to just disappear on the Diaspora side. In the Diaspora log these seem to be accompanied by a "not a valid object" error, often preceeded by a "received a comment but no corresponding post" error. These seem to be purely internal, since sometimes it works for some Diaspora contacts but not others.