I've had my info in my profile for quite some time. I've gotten almost no spam as a result, and have had a handful of pleasant discussions with people from here. Once in a blue moon I get an email that says something like "I saw your comment on FOO and just wanted to say how much I appreciated your take" or something like that. Or one that says "You gave me some advice in the thread on BAR and it was really useful, thanks", etc. Those are the ones I really appreciate.

Haven't gotten many (if any) that lead to much of anything from a career/business standpoint, but you never know what could happen some day.