The Twitterati are stocking their bomb shelters with Twinkies in preparation for the "Twitpocalypse," the time at which the number of tweets sent passes the 2,147,483,647 mark, which is the maximum value of a 32-bit signed integer (technically, it's one-half of 2 to the 32nd, minus 1). Each Twitter message has a unique identifier based on that counter.