I’ve just started using Glassboard. Glassboard is for sharing privately with groups on your iOS, Android or WP7 devices. But while I’ve barely sent a message as yet it fits so well where tools like Twitter were failing. And yes, that means that it only runs on mobile devices at least for now. Could easily work, but for me, having the ability to see activity on my boards from bots, or notify my desktop could be helpful. Maybe. I have to think about that some more. But it certainly seems that way for the use cases I have in mind for myself.
There are other tools that I’ve been using that do similar things (so far) like Groupme which has advantages (at least for now). For example, not everyone I work with or everyone in my family has a smart phone. But every one (at least as of recently) can receive and send text messages. But they also fail in various ways.
I’m looking forward to see how Brent and crew move this forward.