So I have posted a question on MO. It may not be the greatest question in the world, but for some reason it is attracting the attention of some crank user repeatedly signing up as a new (different) user & posting the [same answer](http://mathoverflow.net/a/185444/45057). Slightly more annoyingly, its appearances seem to tie in with downvotes. I am not sure it is the user in question (or even whether a new user can downvote?), but it seems likely. Does this happen a lot on MO? I have flagged the post on 3 separate occasions. Do I keep doing this ad nauseum?