If this is what you do, you're not alone. As I'm sure you're well aware. But given the recent news about FB, are you considering doing your marketing somewhere else? Somewhere that doesn't value volatility the way FB does?
Facebook works as an effective platform to promote your works because of the number of users. However, I wouldn't rely on it now, after learning about the news that it doesn't care about its users' well-being.
Call me old-fashioned, but I just can't stand social media. Well, except for YouTube, and sometimes Pinterest. Facebook has never been interesting to me. If I ever need to promote something, I would rather pay and get an ad on Google.