Enable Federated Network User Tagging
Is your feature request related to a problem? Please describe
You cannot tag a federated network user in Activity or Podcast posts. For example, if I wanted to tag Castopod because I mentioned them in an episode I would type @castopod@podlibre.social in my show notes or my post. However, that only appears as text in the post and does not actually link to or tag the @castopod@podlibre.social account.
This also makes it harder to interact with people through the site. Yes, replies to comments automatically notify the person who made a comment, but what if I wanted to post an Activity update and mention someone to start a new conversation or I tag someone in a podcast episode so they can interact with others. They won't see it.
Describe the solution you'd like
Enable ActivityPub user searching and tagging.
Describe alternatives you've considered
I'm not sure what the alternative solution might be in this case. I could consider reaching out to tagged people directly on another Federated network using a different account and point them to the podcast episode I tagged them in.
Additional context
No additional context.