There is a difference between screaming into your house/apartment when you are angry and spouting nonsense because of it and having a semi-permanent place everyone can read your immediate anger and thus you have twitter. I'm sure a lot of us have been angry at some point in time (we are all gamers and some stuff in games can get you to scream at the top of your lungs when you fail), but you just don't do this sort of stuff. Phil Fish would have been "the brilliant mastermind behind FEZ" instead of the screaming crazy person people believe him to be if he'd never used twitter. IF anything, stuff like twitter and our odd immediate need for instant information has kind of devalued the act of getting the information, and devalued the information itself because people care less about if it's 'right' as long as it's 'right now'. In general I still don't get why people who have trouble saying the right thing keep using it. Some only stop after they say something seriously questionable (see C-Lo Green).
Yes I'm sure there's a lot of truly harmless and some useful stuff on Twitter, but I wonder how much of it is vital.