This allows you to follow Twitter people from ActivityPub. Twitter doesn't federate (it doesn't even allow third party clients at this point) but this bridge will do all of the federation work for Twitter.
Basically, if you want to follow Twitter user @barbazoo, you search for @barbazoo@bird.makeup and hit follow. Their tweets will show up in your client as if they were sent through ActivityPub.
This service can poll/subscribe to Twitter users or search for posts actively, then turn the results into ActivityPub posts.
I run a walled-off version of BirdSiteLive, which this is based off, that does the same thing (but uses the Twitter API which will probably shut down soon). I guess I'm going to have to migrate.
