NFL restricts Twitter use - San Francisco Business Times:

The National Football League has restricted use of Twitter and other similar services by its players, coaches and other employees of teams on game days.

In the past, the NFL had put out guidelines restricting use of mobile phones or other electronics on the sidelines, in locker rooms or elsewhere around a stadium on a game day until the game was finished. It already has restrictions on play-by-play game coverage, and those cover new technology like Twitter...