From the UK Telegraph:

A trainee accountant who posted a message on Twitter threatening to blow an airport ”sky high” has been found guilty of sending a menacing electronic communication.
Paul Chambers, 26, claimed he sent the Tweet to his 600 ”followers” in a moment of frustration after Robin Hood Airport, in South Yorkshire, was closed by snow in January.
But a district judge at Doncaster Magistrates Court ruled that the Tweet was ”of a menacing nature in the context of the times in which we live”.

Very interesting development overseas.

H/T TechCrunch