I was once scammed in an indoor plant group on Facebook thinking being retired law enforcement, I could never fall for such a thing, yet I did. I found out how to spot the scammers now.
1. When they don't list their location on their FB page, that is suspicious. Every legitimate seller will at least tell you what country they're in, if not state and city.
2. Look at the pictures they post. Many times they can be found searching them on Google.
3. Read the replies on the posts. If a scam, you'll either see they are not replying to them (because they are messaging them) or they will reply that they will contact them privately.
4. Scammers never have a website, but that alone doesn't mean they are a scam as some legitimate ones don't either.
5. Read the reviews. If you see good reviews, check out the person who left it as if it's a scam, their account is new.
6. Don't be fooled by the number of followers they have. They have thousands of bot accts these scammers share amongst themselves, plus, they'll go to poultry groups and send out invites to people to follow them. Some just follow everyone who asks.
7. If you think they're legit and you agree to pay via Pay Pal, but they instruct you to check the Friends and Family box, that's a scam. If you don't check it, Pay Pal would cover you. By checking it, you have no recourse.