I'm glad I taught my daughter to be careful/paranoid. I'm also glad she listened.
What we're observing here and in many other different places is the classic problem of technological advancement: Powerful tools in untrained/unexperienced hands. Each of us here has seen the internet/web grow and trivial-to-stupid data-collection services come over us like the plaque. We have a natural negative reaction to post non-anonymous content online or giving some corporation or the public all our data just because they offer a flaky lock-in version of IRC or microblogging. For most users however, that is a very normal thing to do. I cringe each time I see others exposing themselves to abuse and fraud by posting everything under their real name and data. They are one identity theft or one online stalker away from having their entire life turned into living hell.
I set up my daughters Ubuntu Netbook with two mailaccounts, one fake on with a pseudonym and one with her name. I told her to specifically use the latter only for official real-world stuff - sending in homework, applying for some course, etc. and the other for everthing else.
When she went off for a student exchange in Malaysia, she set up a another seperate pseudonymed online Facebook account for the occasion, to be able to cut it lose should things get out of hand. That's daddys smart girl.
Fake/pseudonymed accounts and a general base paranoia about all things online is a must these days if you don't want to be over-exposed to crap from immature teenagers.
I'm glad my daughter caught the drift and didn't wave off her daddys advice on this matter.