[spc476]

Um, I've worked under that assumption since I started using the Internet in 1991. I've found USENET posts I made 15 years ago on Google.

Don't want something public? Then don't put it on the public Internet.

[icebraining]

That's certainly the best option, but using a pseudonymous goes a long way.

[Dysiode]

Unless you want to use Google+ or Facebook. Although, maybe we'll see a resurgence of real name pseudonyms. Now I just need to think of a name as cool as Mark Twain...