Any parent worth their salt would send the kid off the computer immediately upon seeing POS assuming they're swearing online so that's not a concern really. As for lets meet in real life I think stating a time and location would be enough of a give away to let most reasonably sensible people know what was going on.
As for posting under someone else's account vs having two accounts, I suppose the first could be seen as a legal issue while the second would just get you banned from the site.
Question regarding which statement regarding Will I Am songs is worrying? How about the fact that your kid wants the bloody Will I Am song to begin with, and if they do insist on wanting it better to get it from a torrent for free and not fund the record companies for turning out that crap.
That said my mother's boyfriend trashed her windows install by fannying around on the pirate bay and guess who had to fix it. He downloads absolutely anything that's going for free, and thinks just because he has AVG freeware installed he's immune to every virus in existence. He also denies doing it even though NOD32 showed the viruses under his account when I scanned it, through an external hard drive enclosure because it kept reinstalling the viruses when I tried scanning it on the actual system. Mum told him to leave it alone and I was fixing it and what did he do? First thing, he went straight to the power button. And now he borrowed my net connection to access the job centre site to avoid getting in trouble for not trying hard enough to find a job and he's been on the f***ing pirate bay on my connection without even asking if he could do that, and after all the performance we had before. Hell he's hard work for a guy in his 50s. I need to get a new router with a guest network when I can afford it and configure to block all traffic not on HTTP/HTTPS/SMTP/POP3.