Since I've flagged another two users for possible spam on SU, I wondered if it wouldn't be possible to automatically find them. Most of them seem human without any predefined messages, but all of their posts have one thing in common: the link.
This could be a very easy way to find
and delete and flag spam users (so that mods can have a look at it), if, say, 90% of their answers contain a link to the same domain, we can assume that it is a spammer. Additionally searches for the domain might even reveal more bad guys which slipped through the net.
Could that work?