While I agree that substituting a single word is a very easy target and easily manipulated, so that I shouldn't have gone for it, I think "life" is very relevant in this case, as for many people it is either part of their life or their social life exclusively evolves around FB.
All I'm saying is that when a friend of yours decides to share information about you in public, you should hold them responsible and not the channel he is sharing this information. That's it.
Single word substitutions of words that have no relationship with each other do not prove anything. Facebook and life are from entirely different categories in the taxonomy of useful (and not so useful) terms.
The use of certain digital services should be voluntary, not implicit because your associates use it.