Curiousity got the better of me and I had to check this out....'superkitty' seems a very common and popular handle, posts on Nissans (LOL) and one even mentioned cats! Some of my posts did come up, I've only ever posted on TCS, so that was interesting to see. At least the few pages I waded through had no smut on it, so it seems that other 'superkitty' thankfully are clean.
Can't see that it's illegal. Posts are public, and TCS people aren't the only ones reading this stuff. Guests/lurkers are on all the time scanning the posts, and often find cat questions answered without having to register.