I have a report running on vB3.8 which shows recent registration with links in their signatures. It ignores common sites like facebook, twitter, myspace and our own site.
We have a dozen or more signature spammers every day.
I would like to see this facility on xenForo but enhanced so that a number of signature spammers can be disposed of with a couple of clicks.
I have created a video to illustrate (please maximise and use high res)
If you like this idea, please like this post.