@Tommy I would seriously look into how the dark net verifies people. I know most members here will be against it, but as far as I'm aware having users generate a PGP encryption key for themselves and then use it as a 2FA system to ensure the legitimacy of the user before posting. The way it would work best is if prior to making a classifieds post, in the section where you check all the boxes to confirm the rules, PCF has a PGP encrypted string of numbers and letters. This can only be decrypted using the users PGP key (not visible to anyone else). In order to post the ad the user must decrypt the string of letters and numbers and paste it confirming they decrypted it and received the message. This would effectively make it impossible for a hacker to make fraudulent classified ads. I know it would be hard, but it would stop the problem.