We’ve already seen that Twitter is turning into a source of breaking news. But it’s also clearly turning into a way of organizing social movements extremely quickly. “Tweetup” (as in a meetup facilitated by Twitter) has passed into common parlance amongst regular users but now the concept has spawned a global event for charity which will involve nearly 50 U.S. cities among over 100 worldwide, including Beijing, Tel Aviv and Beirut. Twestival, on Thursday 12 February, will happen over a 24 hour period in a kind of tweetathon – except it is Twitter-organised meetups that people will be hitting, not phone lines. And the whole thing came together over Twitter inside 24 hours.