Re:The Wikimedia Foundation joins Mastodon and the Fediverse
by scrollaway on Monday July 17, 2023 @07:02PM
(#36765280)
There is a way in activitypub, but Mastodon itself doesn't support it well. Takahē supports it (https://jointakahe.org/).
We can get half way there with /.well-known/webfinger - but the alias that provides doesn't show up in the feed, so that's not the username I find from links like OP's.