Why am I using these services nearly every hour of my waking life? Because they are being talked about and I want to learn what is making people so passionate...trying to figure out what they are good for and whether the hype is justified. In my opinion:
People everywhere, equipped with cameras and access are posting what they see, for a few friends or the entire world. It is the reporting of everday people and places and incidents that will never be ready for prime time, but are useful and interesting to