I run my own XMPP server, have done for years (now just out of the fact it'll take more work to turn it off than to keep it going.)

I almost never use it to talk to people these days, and typically see one, maybe two other people logged in at any given time, when it used to be a lot more. And I think one of those is someone like me who just has a client always connected. I like what XMPP stands for, but it really does feel like it's faded in at least the "general instant messenger" sense.