Some people have the right idea:
The site is also plagued with weight loss and free gift card scams. There are also multiple fake apps on Google Play claiming to be the official Pinterest app for Android. (Pinterest has thus far released only an iPhone app.) These fake apps display ads on the mobile device's notification bar and may have access to the user's browser history and bookmarks, as well as the user's location[...] Back in March, scammers are taking advantage of the platform's retail-heavy focus to post scams masquerading as free offers from well-known brands such as Starbucks and Coach but really directing users to survey sites. On Pinterest, users are also required to "pin" the original scam and download some kind of software before they can collect their supposed freebie. As users see the offers pinned by their friends, they are more likely to become victims as well.
BitDefender researchers recently identified cross-platform scams acting as a "social network go-between" where Pinterest users are directed to Facebook pages and vice-versa. A recent scam showed an image of Justin Bieber on Pinterest and encouraged users to click through to a Facebook page to see more images. Once at the Facebook page, users are steered towards an endless cycle of survey sites which they had to complete in order to see more scintillating images. In another, scammers took the reverse path, tricking users with a Facebook ad purporting to show them how to make money off Pinterest, but actually dumping users in a "survey maze," according to BitDefender.
Surveys! Fake gift cards! Collecting personal and banking info! Elaborately iced cakes!