I really know no one in real life who uses twitter. Almost everyone uses Facebook to some degree. I think most of the twitter accounts aren't real. I can't wait for it to go away so I never have to hear about it anymore.
Anyway I think most new technologies are actually are negatives to society. Video Games, Smart Phones, Tablets, Netflix, Twitter all stuff to keep you from doing stuff with your life. Shit people don't even e-mail anymore. I guess that is why message boards have gone down hill as it requires you to actually make the effort to type a thought out and use punctuation.