Bluesky feeds are a bit more advanced than that, they are really just collections of posts, so I can make one for every post with the word "guinea pig", or the word "activitypub", and filter them.
Piefed's feeds are cool still.
Once there's a few more apps for it, and the search gets better, I'll be using it.
I had one die on me out of nowhere, the fans would start spinning, but nothing else would happen.
I googled it and the top solution is to put it away for a few years and forget about it, then, it miraculously starts working again.
Hasn't worked for me so far.
Why else are we here?