According to a recent study soon to appear in the Journal of Management, not only is Facebook a horrible predictor of how younger recruits will perform for your business — there is absolutely zero correlation between Facebook activity and job performance — but those who rely upon Facebook to help judge potential younger recruits, are more likely to disqualify African-American and Hispanic candidates, in favor of Caucasian Facebook users.
Kashmir Hill details the study here in a recent article on Forbes.
So, if failing to meaningfully distinguish between younger job candidates, while increasing your odds of being sued for disparate-impact discrimination appeals to you, well then, have at it hoss!