Hypotheticals: How would you handle permanent witness protection? I mean completely ditching everything about your life, deliberately disappearing and starting from scratch. It is difficult enough when you have to do something like change your phone number or your credit card. Imagine also having to abandon your Facebook profile, your email, your house, your car, all your possessions, your friends, your family, your job (and job history) and even your entire name. Call it the Men In Black treatment. All that remains of you - anywhere - are memories.
Let's assume, for the sake of sanity, that you are being taken in by a secretive government agency for some reason. They'll give you a new name, new house and a new job, but it won't be flashy, and it won't be familiar. How long before you snap and what is the thing that makes you break your cover?
For me, I think it would be the internet. Not in and of itself, but because it's the quickest, easiest way to blow my cover and reconnect with people I know and love.
Mokalus of Borg
PS - Bonus question: how would you drop a hint to secretly tell your family that you're okay?
PPS - I'd probably try a cryptic letter, but then it would be hard to know if it worked.