A facebook app called photos at my door -if given permission- lets your facebook friends create and purchase printed merchandise with images from your facebook photos.
Details here and here.
I'm not certain how this can be legal, but if you don't want your photos turning up on other people's coffee cup and mouse pads go to Facebook Settings / Apps / Apps other people use and make sure "My photos" is turned off.
Professional Photographers, this is a pretty good reason to watermark your Instagram photos. Whether you know it or not your IG pictures are being copied and re-posted by other social media users. A visable watermark doesn't prevent the copying but it does allow your photo credit to travel with the image. If your photo is going to end up on a coffee mug without your permission at least you should get credit.
Stephen Alvarez