The ethos of Facebook is The Happy Valley. Positive rules. That's been documented by research and experience. A useful read on that is e-book "Contagious Content," which you can download for free here.
Those who flourish in The Happy Valley are usually tribal. They enjoy being part of the communal celebration of anniversaries and sharing of advice. Those who don't tend to embrace a Shakespearean world view. We see people as "cankered in the grain." The wisdom of crowds can quickly become the brutality of the mob. So, we are cautious, not expansive on Facebook.
Despite the caution, the tribe moved into my space. Members had many suggestions for me. One was a posting on how, now that I live in sun-drenched Arizona, I can purchase quality sunglasses for under $35. That was by someone I had gone to Seton Hill College, Greensburg, Pennsylvania with way back in the 1960s.
Have I never shopped for sunglasses before? I actually had a panic attack. Called my therapist back in Connecticut. She and I also added to the reasons for pulling the plug on Facebook: I am way too private for all that sharing and liking.
More to the bottom line: In the three years I invested on Facebook, not one bit of business came my way. Not one. Somehow the ROI doesn't seem too swift. I do receive business from participating on LinkedIn and my three syndicated blogs. The other two are here and here.
Millennials have been fleeing Facebook. Maybe they are onto something.