Until 2009 Twitter simply asked us "What are you doing?":
People, organizations, and businesses quickly began leveraging the open nature of the network to share anything they wanted, completely ignoring the original question, seemingly on a quest to both ask and answer a different, more immediate question, “What’s happening?”Which sort of explains why we're now asked:
The fundamentally open model of Twitter created a new kind of information network and it has long outgrown the concept of personal status updates.And just maybe it wasn't only an issue of outgrowing the "concept of personal status updates", but also a change in the users' desire to post those updates.