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Dave Martin, Associated Press
LSU cornerback Tyrann Mathieu grins as he waits for the team portrait during media day for the BCS championship NCAA college football game at the Superdome in New Orleans, Friday, Jan. 6, 2012. LSU is scheduled to face Alabama for the national championship on Monday, Jan. 9. At left is LSU cornerback Morris Claiborne (17).

NEW ORLEANS — Tyrann Mathieu signed up for Twitter at the urging of a teammate.

It didn't take long for the LSU star to realize the benefits — and pitfalls — of social media.

When Mathieu wrote a trash-talking tweet to a Florida player, the mainstream media quickly picked up on it. When he went on Twitter trying to sort out an embarrassing personal matter, the whole world quickly found out about the Honey Badger's business. Mathieu says he's learned his lesson and now just tweets "about things that people don't really care about."

Unlike some schools, No. 1 LSU and No. 2 Alabama allow their players to use social media. But the teams in Monday's BCS championship game at New Orleans know their coaches are tightly monitoring everything that is written.