Considering most of these are run off small VPS instances, you should look for one geographically close, without too many users, that isn't on the banlists of s

Considering most of these are run off small VPS instances, you should look for one geographically close, without too many users, that isn't on the banlists of servers you want to talk to (I'm assuming that you aren't interested in self-hosting). Maybe you should first identify some people you'd want to follow, and use that to narrow things down?