Twitter, MySpace, FaceBook, Orkut, LinkedIn and the rest are literally a virtual revolution in communications. When Gutenburg cranked out the first movable-type book in 1454, his so-called 42-line Bible, the world was turned on its ear. No longer did it take years for scribes to create new works that very few people could read. After Gutenburg, real books began to appear, and this astonishing development led to the Rennaisance. Then, about 150 years ago, the world was upended again by the invention of the telephone and telegraph. Then came moving pictures and photography. All these inventions had one thing in common: they were produced by a professional, and delivered to the masses one by one. The latest world changing event concerns our own version of all this, the social media sites. The difference is this--no longer are the pros in charge. All of us produce this information, this content, and we have access to all other users. Is this cool or what?