The Breakup Notifier has received a lot of attention in the last days. Depending on your viewpoint, it's a really neat or really scary app that sends you notifications when the relationship status of your Facebook friends changes. I don't believe it provides a lot of actual value, but it makes for a good story to talk about the "codification" of social relationship on platforms such as Facebook.
Nice infographic video from The Economist, trying to assess likelihood of a successful revolution in Arab countries. Even if the exaxt methodology of weighing the different factors remains unclear to me.
This recent tweet on the situation in Libya is spot on: Never before have we been able, thanks to tools like Twitter, been able to follow what is happening in a crisis situation so closely and precisely. But information does not necessarily translate into action.