Actually, the part that annoys me more about the new "social" intarwebs is all the morons complaining about people knowing they're a Justin Bieber fan after they posted the same on their "marked private" Facebook account. That said, I do hate things like when Google makes GoogleTalk sign-in automatic when you go to Gmail unless you turn the setting off explicitly. They made the same mistake with that stupid Buzz crap. I anticipate with Google that I'll have to opt-out rather than opt-in with this social shit too. That's Google's MO of late.
The real problem is the mass assumption that we all want to be involved with this social networking bullshit on the internet. I got over the idea of having a web page all about me back before Netscape died. It's all just narcissistic egomania. People don't need these damned webpages to keep in touch. Facebook users are just sheep following the latest advertising phase. I do just fine keeping up with all of my friends with (shock) email and a phone. Hell, I even see them in person sometimes! People should try it!