Law.com:  ‘Lawyers are calling it social networking burnout.  Back-to-back studies, the most recent issued Tuesday, show a big chunk of corporate America is banning communication wonders like Twitter and Facebook from the workplace.   According to the latest survey of more than 1,400 U.S. companies, more than half (54 percent) said they prohibit employees from visiting sites such as Twitter, Facebook and MySpace while on the clock.”