Callan Green, senior social media specialist at Sony Electronics, never thought she would want a pair of leather pants. “But she saw enough pins on Pinterest that she thought, she have to own them, and she went out and bought some.� The image-based, pinboard-sharing social media site launched in March 2010 is now the third-largest social network, behind Facebook and Twitter. Here are 6 things Sony did to make Pinterest work for them:  http://tinyurl.com/78yp8ev