Where Facebook makes their money off of you, via NielsenWire:
As social networks have picked up a greater share of digital ad dollars, a key differentiator they emphasize to brand advertisers is the ability to harness the power of friend recommendations when it comes to sharing experiences and content.
Last week, Facebook introduced new advertising products that highlight friend connections on the site to make marketing more inherently social. Though social ads were previously available on Facebook, last week’s announcement signifies even greater emphasis on this unique form of advertising.
Nielsen’s preliminary research suggests that, on average, social ads generate a 55 percent more ad recall when compared to non-social ads, meaning you’ll see more and more of this.