I just gave up on ever being able to really be anonymous, after I had a rather sobering interaction with Disqus.

I had never used it, and wanted to leave a comment on a site (long ago -can't remember where or when).

I started to sign up for Disqus, and it helpfully asked me "We found all these comments from around the Web. Should we associate these with this account?"

It included some old, dead-and-gone-I-would-have-sworn-it troll postings that I had pooped out, back in the last century.

I immediately deleted my signup, and went and had a lie-down.

These days, I deliberately make it obvious who I am, and post as if I had to stand behind my words.