why are people obsessed with online networking sites, such as twitter?

[E]

why do people want to report their lives online. i dont get it. doesnt anyone want privacy anymore. i think its fine to have something like a facebook or something like that to keep in touch with people from high school or college or what ever but really, i dont need to know that you just ate dinner some place and post a picture of you drinking some drink or partying in vegas. ugh its so annoying. and arent people a little weired out that once you post pictures of your self online people can stalk you on their and just randomly come up to you on the street and know who you are. it happened in nyc a few months ago, some like 13 year old updated her facebook status and said that she was home alone watching movies and her parents were out of town. yea thats real safe, no surprise that some freak showed up to her house bc he found out where she lived from comments on her page and info that she gave out such as her school and stuff.