-A person preparing, or "prepping" for the day they will deactivate their account because Facebook either begins charging for their services, or Big Brother takes over the entire site. Prepping activities include gathering friends' email addresses & other important contact information, deleting or at least backing up all photos, and censorship/deletion of all questionable Facebook activity.
"What if Facebook started charging fees to use it?"
"I'll never pay, & I'm not worried--I'm a Facebook Prepper. I can bail anytime."