Pinterest is nowadays are strictly applying their user policy. Which I think is too hard to follow. For example: They are not allowing short URL's, Posting one Pin in different groups/Boards (even in same niche) leads to permanent banning as they are considering those Pins as Spams. Once they deactivate your Pinterest Profile they will never consider it for reactivating. Even popular Social Media Sites like Twitter, Facebook, VK, Myspace considers short URL's, affiliate Links and repetitive postings, while Pinterest is strict to their rules. Though it's provide good social media platform.