Most Facebook users have said something on their Facebook pages that they regret, but probably not many like Indian citizen Shaheen Dhada, who was arrested and faced angry mob riots in India over comments she made on her Facebook timeline. Comments that many charger were aimed to malign Muslims with the Shiv Sena party.

Arab spring, flash mobs, and last week’s riots in England. What two things do these have in common? Well, first, they have a people ready to be incited to action – be it for the cause of democracy, for a flash mob, or for chaos, mayhem, and lining their own pockets with ill-gotten goods. And second, social media has contributed to the lightning speed with which each of the groups coordinated and coalesced.