@darius @ryanrandall @jessamyn @dansinker

This feels like a somewhat overlapping/orthogonal feature that might not necessarily be a Mastodon-service feature. If the need is "know when someone has linked to your post", where "link" also means "an activitypub post was acted on in a way that includes the subject post as a link in the body", then sure, a ping from the server making/hosting the original post makes sense.

But the wider case is "know when people are talking about you"...