I’m migrating more to blueskies from Twitter. (I refuse to call Twitter its new, surely temporary, name.) Blueskies is not run by a madman, that I know of. It does not display results of an algorithm who you follow like Twitter and Facebook. It is in beta with not enough servers to scale up far so is less responsive. But more stable. There is clear interface but not back channel DM built in. They claim to clamp down on racists and jerks, but at this point they are at least not inviting them back like Twitter. Not a lot of haikuists yet, but some botanists and poets. Apparently Neil Gaiman is aboard.
I have a couple invitations if you like.