Linda: What’s Up With Pinterest?

On her Facebook wall , Linda Lantzy/Idaho Scenic Image asks a question that I’ve wondered about: ” Would someone explain Pinterest to me, from a photographer standpoint. I made an account a month ago, put up 1 photo and never went back. I get lots of notifications of people following me. An internet search today found a bunch of my images there, hijacked from all over the place. Most are watermarked and I dont care. Should I be using this site? I have no interest in making pinboards of food, clothes, decorating, etc. Why are people following me? I don’t understand it.”

Question: Anyone care to explain Pinterest from a non-photographic point of view?