Scammer uses the dreaded survey form to lure people to fill it out. Scammers earn commission the more people they manage to drive people to online surveys. If they are the nicer scam artists, they will sell the info to third-party marketing firms. The old adage continues to hold true: If its too good to be true, it is. If it was reputable in any way, retailers would be advertising it themselves.”]
Source: https://nakedsecurity.sophos.com/2011/11/14/shopping-spree-morrisons-facebook-scam/