Or a British individual who was detained and questioned for tweeting "Free this week, for quick gossip/prep before I go and destroy America?"
http://www.dailymail.co.uk/news/article-2093796/Emily-Buntin...
http://www.dailymail.co.uk/news/article-2093796/Emily-Buntin...
http://cms.fightforthefuture.org/teenager/
Don't mind the petition though, last I heard was that his family was getting him out of jail with him not being indicted for anything. The authorities seemed to get a good amount of public pressure.