While the British scammer mentioned in the introduction to this article met his victims in person, most scammers will avoid face-to-face meetings at all costs.
Even if they say they live near you, they’ll say they’re out of town and won’t be able to meet. However, repeated excuses at the last minute are a definite warning sign.
They’ll hit you with the full force of their charm; they’ll say sweet things, compliment you a lot, and talk about how perfect you are for each other within the first couple weeks.
Think about if you would find it strange for someone to be acting like this if you just met in real life.
If their profile says they’ve lived in Ohio their entire lives, but they’re using non-standard English, or have notably poor grammar, that could be a warning sign (think of the kinds of errors you’d see in a Nigerian scam email or on the phone, where they need to spontaneously come up with things to say. Obviously, there are plenty of non-native speakers out there who are sincerely looking for a relationship, and they could very well be from heritage speaking communities in the United State or Britain.