US bars friends over Twitter joke. The Sun (UK), 30 Jan 2012.
TWO pals were barred from entering the US after innocent tweets joking about "destroying America" were picked up by the country's anti-terror cops.

US special agents monitoring Twitter spotted Leigh Van Bryan's messages weeks before he left for a holiday in Los Angeles with pal Emily Bunting.

Leigh, who also quipped about "digging up Marilyn Monroe" on Twitter, said they were treated like terrorists on arrival at a Los Angeles International Airport. The pair were held by armed guards and quizzed for five hours before being handcuffed, put in a van with illegal immigrants and locked up overnight.

....
Agents even checked the pair's cases for SPADES and suspected that Emily was to act as "lookout" while Leigh raided the film beauty's tomb.
British Tourists Arrested in the U.S. for Tweeting. Bruce Schneier's Blog, January 30, 2012.