Earlier today Mary-Kate and Ashley Olsen appeared at a Barnes & Noble book signing, only to be met by PETA's Trollsen Twins, a two-some against the Olsens' use of fur in their wardrobe. Okay, well maybe they didn't come face-to-face, but PETA's Ashley Byrne told OK! that the Olsens "can hustle in the back of a book signing and they can avoid these PETA protesters, a lot of who grew up being fans. But they......