Holidaymakers have been warned to watch their words after two friends were refused entry to the US on security grounds after a tweet.
Before his trip, Leigh Van Bryan wrote that he was going to "destroy America".
He insisted he was referring to simply having a good time - but was sent home.
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http://www.bbc.co.uk/news/technology-16810312Big Brother is watching you... do we have any freedom these days?
