Even if they're bad clumsy obvious scams, here's what you do. Take a printout of everything, hand it in at your local police station, and stress to the desk officer that Interpol likes to be kept in the loop on all online fraud. Why is it fun? When pretty Rosa from Portugal promises she loves you, tell her you're taking her messages to the cop shop. Kills the romance, but funny when they start swearing at you
So you are basically telling people to waste the police's time with stupid paperwork, stopping them from investigating real crimes where they have a chance of making an arrest.
Perhaps in future you might consider thinking before posting?