I personally find all these social networking programs to be a slow start to the decline of human interaction in many ways. I learned how to socialize with my friends from childhood by watching my parents. Pick up the phone, call, walk next door, whatever and get things done face to face. While that is still done today, it's not as prevelant in today's youth. As they get older and start having their own kids, those little tax credits will learn from watching their parents interact, which in many cases is done through phones and computers. This is also showing up in school papers where kids are writing papers like they write text messages.
I also found it alarming how some trapper keepers these days contain all the abbreviations for text message lingo and other related things. Also, facebook has been having some issues these days with spotty connectivity and some people are threatening to sue because they can't access their pages?!?!?!?! What is that about? Are you so involved on that site that you can't live your life without it? While technology is great in many ways, it is also destructive to human nature. My kids are not allowed to have Twitter, MySpace or Facebook accounts, have only 3 days a week they can play games for about 1 hour each day. I like how my kids actually decide to do something like read, write, draw or mentally stimulate themselves instead of having their heads buried in a phone all nightmare long.
/rant over