+ = ???
Twitter announced yesterday that it has acquired Posterous, the popular, lightweight blogging service. There is no information about the fate of Posterous though. Twitter's announcement made note that it was acquiring Posterous to "obtain talent and technology". There is no mention of whether Twitter will incorporate Posterous into Twitter, keep it running as is, modify it, or shut it down.
Any teachers using Posterous should probably start looking at alternatives, just in case.
Some alternatives could include:
Google Plus (Google+)
Posterous may still be around, but there is no information on it's fate yet. Be prepared and have alternative plans if you use it.