Certainly the cultural compatibility will need to be evaluated eventually, it's just not in a minority candidate's best interest for that to be involved in the first-pass filter. If you'd like to know about my non-work interests we can talk about weight lifting and camping during an onsite interview.
I want to be firmly cemented in your mind as a competent developer before you find out what I wore to last year's Halloween party or who I favor in the upcoming election.
So fine, don't show me Facebook - it's just that's the one source of info everybody has.
I'm going to be much, much more interested in your github profile, posts to mailing lists, etc.
First thing I do when I get a CV is not go to Facebook - I google the email address. If there's contributions to tech mailing lists there, the rest of what I see is going to have to be pretty shit for me to rule you out for interview, to be honest.
I want to be firmly cemented in your mind as a competent developer before you find out what I wore to last year's Halloween party or who I favor in the upcoming election.