I have seen many scammers here. They are usually quick to post beautiful pictures, and to invite people to message them, but are not so interested in learning languages, and their way of speaking doesn't match the languages they claim to speak and study, nor the location they claim to come from. But don't rely on spotting these red flags - don't be open by default. Keep your guard up, by default, for everyone. Don't give your external contact details or personal information to someone who didn't earn it, and be extra suspicious if anyone asks for money.