Be wary of profiles that are only professional photographs, that fall in love within a few messages, or that cannot meet because they are suddenly abroad, on a contract, or in the military.
A real member can answer an ordinary question about the town they claim to live in. They can also stay on Only Dating. A fake one will try to move you to email, text, or a link.
Use Report on the profile. Do not argue with them and do not send money to "prove" anything. We review reports and we remove accounts that are not real people.