I agree on all points. There's no expectation of privacy for things you post online, really. But I think it's asinine for employers to ask for passwords and the like. I don't have a Facebook.
Googe a screen name, piece together a name (especially if they use something like names and initials for various sites), google court records and assessors sites. 90 seconds or less, most times.
You shouldn't expect complete anonymity in the internet, ever. So be wise what you do and say as it can be found.
But at the same time, people sure like to recycle names, info, accounts etc.. (myself included). We seem to lost track of the complete facelessness we used to have online, and we now focus on having these images or personas we project online (this predates myspace or facebook or whatever). It's like when people try to define who "Anonymous" is. Well, they aren't a cohesive or organized group , per se They are simple individuals that deside on occasion to engage in similar activites. But they ain't a club. There's no membership or anything. Just some people who originally got together on a website used for sharing images.