I'd argue that Facebook has the best 'quality' when compared to the other social networks in the USA. The UI and feature set are much better than any of its com

I'd argue that Facebook has the best 'quality' when compared to the other social networks in the USA. The UI and feature set are much better than any of its competitors. Facebook is dominant in the USA; the only competitor is MySpace which seems to fill a different niche. Facebook = keep tabs on people you know, or sorta know. MySpace = meet random people you don't know, get spammed by porn bots, irritate your ex by posting salacious photos of yourself with a new fling, browse photos of potential mates in a criminally inappropriate age bracket from yourself, etc.