Are you trying to win a new RV, sports car, or maybe a tiny house you saw on a Facebook promotion? How about those free miles on a popular airline? Chances are, you are being duped. An investigator with the Better Business Bureau says those that are generating these posts are in the business of building lists they can then sell to other marketers, and there is no prize waiting for you.

Agency investigator Don O’Brien says you need to be careful what you share.

If you have entered a contest like this, O’Brien says you probably won't lose money, but you could be spammed by ads.