I'm a writer. I do many things, but writing is one of my favourites. I use my blog mainly to pontificate about a variety of topics that may or may not be interesting to anyone. I don't let that stop me.
If it looks like I haven't posted in a while, it doesn't mean I'm not writing. My writing will appear elsewhere. And if I'm not writing, I may also be out taking photos.
Facebook is making money via ads and other ways I'm sure. I hope they'll improve their ad quality, but I'm not banking on it. If you're thinking of doing online ads, think of the magazine model.