Well, that’s a bit hyperbolic. In fact, there are ways in which Pinterest might help your business grow. But there are also ways that Pinterest might get your ass sued by someone who’s slightly pissed that you gave away the rights to their content without permission:
Unlike other social media services, when you ‘pin’ something on Pinterest, you automatically upload an (at least) medium-sized version of the related image to the service. Exceptions for publishers of user-generated content protect Pinterest, but they don’t protect you. Unless you know you have a “worldwide, irrevocable, perpetual, non-exclusive, transferable, royalty-free license,” you’d better tread carefully.
You see, Pinterest’s fine print contains the possibility that you’ll be massively screwed if you use content that you don’t have permission to give away; this is understandable, since it would seem that Pinterest can do whatever the hell they want with the image you pin to their sight.
So be careful, all you users of Pinterest. Also, stop pinning pictures of doughnuts and cakes and assorted savory items–some of us are watching our girlish figures!