Here's your answer, from a website called pooristhenewrich.com
"Starbucks Gift Card Scam
The latest Facebook scam -and there are enough to write a book about- targets fans of Starbucks. The bogus ad promises Facebook users a free $50 dollar gift card if they "share" the ad with their friends. But those who reposted the ad to their stauts updates were instead re-directed to shysty survey sites. Sorry, no Starbucks gift card.
Yep, better start scanning for viruses and malware. And it may not be a bad idea to change your Facebook password, too.
According to reports, thousands of Facebookers have fallen victim."