Looks like 500.
The communities thing is a good point and is why I don't feel I need to follow hundreds of people - Going there is a nice place to browse specific content although I have noticed many don't follow the community guidelines and post randomly.
I wonder how many of those are actually active anymore, or how many I still interact with. I could probably whip up a python script that gathered that for me but, man, I'm tired of coding, and it's probably whimsical information at best, anyway. I'd rather have a coffee.
Have a coffee and do some culling; it feels good.