Social recruiting, specifically sourcing from social media outlets, is getting tougher every year. LinkedIn has effectively locked their platform down to the point that it's easier to get a recruiter license than hack it with Google and a good command of Boolean search. And the price of recruiting licenses continues to climb.
Facebook has removed your posts from the content feeds of nearly all the people who follow your company. As few as 2% of people who like your page ever see your posts these days.