So far, across all our properties, Facebook Dark Posts are outperforming every other traffic acquisition channel. The trend is even more true in 2015 than it was in 2014, FDPs work.
What Are Facebook Dark Posts?
For today one of the most effective advertising plays on Facebook is something being called ”dark posts.” The term, while sounding a tad evil, actually applies to the tactic of using news feed style ads that do not actually get published to the newsfeed of your page. – Duct Tape Marketing
Dark Posting is A/B Testing for Facebook Ads. You get the opportunity to test ads and see how their convert beforehand.