Tennis authorities are telling participants in the US Open, which begins Monday, to watch their tweeting. Signs are posted in the players' lounge, locker rooms and referee's office at the USTA Billie Jean King National Tennis Center with the header: "Important. Player Notice. Twitter Warning." The signs, written by the Tennis Integrity Unit, point out that Twitter messages could violate the sport's anti-corruption rules.
"However popular it is, it is important to warn you of some of the dangers posted by Twittering as it relates to the Tennis Anti-Corruption Program Rules." The signs say tweeting is not allowed on court during matches. They also warn about using Twitter away from the court, saying sending "certain sensitive information concerning your match or other matches and/or players should be avoided. Depending on the information sent out this could be determined as the passing of 'inside information.'"