Just set your privacy to show sensible data only to friends, ditch all those stupid apps and crappy games like FarmVille that suck your time and life, and you can be quite fine with FBK. About coolness, naaaa, it never was cool, it's just useful when it gives you more and better features than chats, forums, SMS, etc. Since I use FBK, I almost don't need SMS anymore. It reminds me of birthdays better than personal info managers, as I don't have to put the dates into it to be reminded of them. I get more up-to-date infos about dance evenings than in specialized sites. It's excellent to fix dates with many friends. It can become really fine and useful, especially, if and when you get over that phase when you always feel the urge to check it and it literally eats your time (many people go through this troublesome phase also with plain old e-mail).
Stwike him, Centuwion. Stwike him vewy wuffly! (Pontius Pilate, "Life of Brian")
A fart without stink is like a sky without stars.
TGS, Third Grade Shooter: brand new genre invented by Kevin Butler exclusively for Natal WiiToo Kinect. PEW! PEW-PEW-PEW!