A screen grab of the BBJ's pinboard, showing architects' renderings for planned buildings throughout Boston. After a careful read of the fine print, it has been taken down.

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. I was not able to immediately reach Pinterest, for comment.