I'm renaming Tweet Marker Plus. Its new name — to better reflect its gradual move away from Twitter and syncing — is Watermark.
As part of the relaunch it immediately gains a new feature: App.net posts. You can now add an App.net account and it will download any posts from your friends, making them available for search. Watermark is already storing tens of millions of tweets, and I'm excited to start adding App.net posts to that archive as well.
So what happens to the basic Tweet Marker API? For now, nothing. The sync API that over 22 Twitter apps support will still be called Tweet Marker and remain Twitter-focused. Think of Watermark as a separate app: a new kind of client and archive tool, independent of Tweet Marker.