Then use it for exactly that. The point is if i use facebook for having a profile cause my employer wants me too then i can afford to (mostly) ignore facebooks

Then use it for exactly that. The point is if i use facebook for having a profile cause my employer wants me too then i can afford to (mostly) ignore facebooks policies on privacy or real name policies, because i want my real name to begin with and don't give them every crappy detail about my life... or explain to your employer why you don't use facebook and see how he reacts! I read once about some security expert who had to deny connections to hackers as part of his job and then instead of doing that explained to his employer that he is part of the hacker community and is speaking at hacker conferences etc and what he considers to be a hacker etc and it turned out to not be such a big deal as he thought in the beginning....