affinity group

plural affinity groups

1. A formal or informal group of people formed around a shared interest or common goal.

   1 more example

   But in my corner of the app — the fans and critics who gathered to riff on TV and the real-life events that filtered through it — it feels like the end of an era. Even the finale of “Succession,” a big deal among my affinity group of TV junkies and media obsessives, felt like a trickle next to the big tweetwatches of the 2010s.

   2023 July 10, James Poniewozik, “The Twitter Watch Party Is Over”, in The New York Times