This is what I'd worry about:
If I attended a protest like Occupy Wall Street or something, and gmailed my friends about it. Then, a year later, was told that I can't board an airplane because I'm on a no-fly list.
If I attended a protest like Occupy Wall Street or something, and gmailed my friends about it. Then, a year later, was told that I can't board an airplane because I'm on a no-fly list.