ActivityPub is a really cool protocol because it can be (and is) used for things that's not social media. It's also been an open standard since 2018.
In regards to the Fediverse, being a subset and all: I like talking to people on here, some of you may be opinionated (and therefore a lot of personality clashes happen) but at least you stand for something as opposed to nothing at all. Gotten really tired of that latter lately.