Yeah, even posting anonymously on the internet your identity could probably still be found, given someone sufficiently motivated to find it.
Was interesting maybe a year back we had someone post anonymously and then had a thread on people trying to work out who it was, knowing it was someone who had commented a decent amount before. People were applying algorithms to attempt to work it out, no idea if anyone ever did, can't find the thread.
Unfortunately, you can't get the first without the second, as witness the leak of the "journolist" e-mails.