Could links be blocked possibly? Possibly also a post length limitation?

Working on another solution

How about adding a secondary page with a captcha if a url has been detected, or block the post if more than 1 urls have been detected. I've done that before and it worked out well.

That's a good idea. I'll try it if these quicker fixes don't work.

Well, it looks like it's working

Nevermind, just got hit

That was from an older account that was created before I implemented the new fixes to prevent bot signups. There shouldn't be many more of those.

I'm assuming this was fixed a while ago?