RSFB
ReSpond via FaceBook...The modern day equivalent of a RSVP. To respond to a party invite via FaceBook instead of other Neanderthal methods such as a telephone
Dude1 - Heh dude, I was thinking of getting a couple of buddies together to go drinking at the park this weekend. Should I call you ?
Dude2 - No dude, just FaceBook it and I will RSFB you
Dude2 - No dude, just FaceBook it and I will RSFB you