There are lots of interesting people on Mastodon, I would recommend searching by hashtag and joining an instance that matches your interests (eg: sdf.org, sergal.org (furries), cybre.space, etc).
Many instances block Mastodon.social and other massive instances, and different instances will have different views of the network (based on who the users of the instance follow and how long toots are retained).
I do wish mastodon had the concept of groups so I could join all the groups I'm interested in rather than having to sign up for an account on each one.
eh, I don't really even use Twitter to talk with randos online... I get enough of that here. But I can see that people do use Twitter and Mastodon that way...
