Hook-up sites that lead members to quick meetings and random liaisons can be used to target people for hate crimes.A form of catfishing, fake users meet their victims online and then lure them to an isolated location.
This is one of the easiest warning signs to spot early on in your communication with someone.
If you notice that the person you're corresponding with only has photos that seem outdated or that have been taken from far away or from extreme angles, it's not unreasonable to suspect that she might be hiding something and probably does not look quite the same in person.
Black hats could target traffic for the purposes of spreading malware and/or viruses.
Traffic could be diverted to clone websites where users willingly download malware to their computers.
If he claims to have an impressive education and credentials but his current situation does not seem to match up to those claims, he may not be telling you the truth.