Social media continues to grow at an enormous rate. It seems everyone has a profile on one of the numerous social media sites. In an effort to be the premier social media site/outlet, Twitter has began to sign deals with multiple companies and networks. These partners agree to use Twitter to advertise products and give them exclusive content (highlights, special videos, etc.) Recently, Twitter added CBS, their largest partner yet, to its growing list of partners.
http://bits.blogs.nytimes.com/2013/09/23/twitter-adds-cbs-to-its-stable-of-big-advertising-partners/