Yes, but I lost the password to it awhile ago so all it does is spam my inbox with "news in your field this week" stuff

I know7, I could just go reset the password, but I haven't bothered. I'm not looking for a job, I'm quite satisfied with mine, and the profile info in there is fairly current anyway, so I haven't bothered with it.
On the last two questions, no, I've never gotten contacted through there for anything. I got my job via recommendation by a friend when my employer was looking for someone a couple years ago.