That $50 Lowes coupon popping up on people’s Facebook feed is indeed a scam. Please do not give them any of your information or try to use the coupon. It has been confirmed by Lowes corporate that it is a scam. These people are trying to ascertain your email and mailing address so that they can sell it to people who will send you spam and advertising.
Most of these contests are just that scams. I don’t fill out anything that isn’t from a legit blogger or legit website. I see them all the time “Win $100,000 Amazon Gift Card” – really are you kidding me. Common sense should tell you that one one is giving away a $100,000 Amazon Gift Card. Stay away or you will get burned.