We've just had one that I reported and it's very quickly been deleted which is good because it saves posters getting sucked in and wasting time when there are other, genuine posters, in need.
I feel for HQ having so much crap to sort through every day. I was a mod on a forum with much less traffic than MN and at times we'd get totally bogged down with troll invasions. Can't imagine the numbers here, but it does mean that some trolls are bound to go unnoticed, for quite a considerable time.