I've been posting here and using brid.gy to post to twitter, but that ain't automatic, not that I can tell. So I go to my brid.gy page and paste stuff in and post it. I duplicate post here and (accursed) Facebook. I even post to (doomed) G+ sometimes, and to mastodon too.
Gotta be some better way to POSSE. I'll figure it out. Or I won't.