Facebook already dominates. It has achieved massive scale. It is a major part of hundreds of millions of daily lives. Focus on making it the app that -- in an organic way, by user choice -- occupies primo real estate on "every" smartphone.
An awesome and fulfilling no-strings attached relationship. Facebook wastes resources by making things more complicated for what will ultimately be little or no net effect. It might even turn into a slight negative.
Don't succumb to the sin so many other media/tech companies commit. Focus, Zuck, focus!