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Mastodon actually has 407K+ more monthly users than it thought
(techcrunch.com)
This is a most excellent place for technology news and articles.
For me it's probably best described as "background chatter", so mostly a bunch of different news sites that aren't important enough for me to go into my RSS feed, bots posting notifications, and random thoughts from bloggers.
There are those that help you to stay on your home instance as well, but the big one for me is StreetPass for Mastodon, which finds and collects Mastodon accounts as you browse the web. That way you can organically build your network without much effort. You'd be surprised how many accounts from news sites, open source projects and people with blogs you can find that way.
StreetPass is such a fantastic idea, I had no clue it was a thing but it might actually be the thing that manages to get me into microblogging