We’re working hard to give rstat.us a Twitter compatible API so that clients could theoretically just switch a base URL and join the federated social web.
The 100,000 user token limit applies only to the small set of clients replicating the core Twitter experience.
It’s fun to say things like that, but it would be nice if they helped us out a little by defining “core Twitter experience”. Do third-party Twitter clients that add significantly to the experience (TweetBot, TweetDeck, etc.) by adding extra features not found in the first-party clients count?