Only one, I was tempted to sign up to another but I only just about got a nice mix of subscribed communities on this one and don’t have the patience to go through it again. I don’t really see the point, either, unless you are signing up to a second one that isn’t federated with your current one.
Also, shout out to ReddThat.com, absolutely zero glitches or issues so far except for those that seem to be fediverse wide. Good place to be with good people.
It feels like home! I didn’t think it would, but I’ve settled in. I like that it’s a smaller community as I feel my comments count for more somehow. I also like that we’re all (or at least a large proportion of us) just a little bit clueless about what’s going on or how stuff works round here - we’re muddling along together as best we can and it’s lovely.
It feels a lot like Reddit did back in the early days before it got popular, in fact. And I think the existence of multiple instances as opposed to one site has the potential to keep it that way - if your instance gets too big or too busy for your taste, migrate somewhere quieter or even create your own.