I signed up for Facebook several years after I joined LinkedIn.  In fact, I even joined Twitter six months before becoming a Facebook member.  A year ago you could of said that a Gen X guy on Facebook was not the norm.  But now that there are as many Facebook users aged 25 to 54 as there are those that are aged 18 to 24, I would consider my demographic fairly average these days. So you can imagine how surprised I was when I uploaded my LinkedIn contacts to Facebook and found an acceptance rate of only 10 to 15% …