On Drupal Answers we just had a spam question (now deleted).
The question's title was, in its entirety:
I can't think of a good reason that any reasonable question, on any site in the network, could consist of only a URL.
I think such questions should be blocked before they are asked; can this be implemented?
And another one today (a couple of months later):
Over a year later and it's still going on:
Any chance this could be looked at?
Updating yet again as we just had a particularly disturbing one advertising something called "mutilation theatre". www.mutilationtheatre.com.
I don't think there's any question we do need this, hopefully someone from Stack Exchange will respond this time.