Why Tweets are bad for you - the evening standard

According to last nights London Evening Standard the following can be said about Twitter:

"Is Twitter good for your mental health? No, according to neuroscientist Baroness Greenfield...she has charged social networking sites with creating a generation of fantasists with no capacity for social interaction. 'your attention is fragmented...your actions have little consequence'  Could it mean you are meanlingless and need conversation which is why you go onto something like Twitter and say 'look at me...look i'm doing this...' Could people who tweet a lot be in extistential crisis..."

what are your thoughts? are you in a crisis? why do you use social networking sites in any form? are you needing attention? do you get no attention in other formats? let me know.