simply put, my life is way to boring to tweet, but for fb:

like it, hate it, be ambivalent - i have over 70 FB contacts related to Bz in some capacity alone. i can pop on and say hi to any one of them, leave a message - public or private, see everyone's photo albums, it has IM functions, folks can post a link - or opinion - on any topic in the universe and most likely not get slammed with personal insults (and i learn much from some of the posted links), no one fights, no one snips, there's rarely any negativity....personally, i like fb and think its a neat tool.