So, here’s a plugin that implements a basic Known to Known cross poster, which uses the Known API authenticated with OAuth2 using my OAuth2 server.
This post will let you link an account on one Known server with an account on another Known server, and allow you to crosspost status and text posts from one to the other.
Primarily this is a demo of OAuth together with the Known API, but it might be handy if you have, say, a corporate blog but still want to post to it from your main site.
Pull it apart, play with the OAuth and see how I talk to the API!