I left Facebook as soon as I realized they weren't reputable (some time around 2010 or 2011). By the time I left FB had already repeatedly betrayed user trust via "opt-out" security settings.

    having a good social life was (and remains) vastly 
    important to the quality of my life, and that 
    Facebook is a tool to help achieve that goal.

From 2017: "A New, More Rigorous Study Confirms: The More You Use Facebook, the Worse You Feel"

    Standing up for your principles and "voting with 
    your wallet" is good and all, but ... I'm not so 
    sure it's all that effective.

From July of this year: "Facebook on Thursday posted the largest one-day loss in market value by any company in U.S. stock market history after releasing a disastrous quarterly report."