A.
Like others, I check here daily.
I use FB for selling Randall knives and seeing what people are talking about.
As Mitchell said, FB has more exposure to larger groups for selling and Messenger allows instant communication with someone interested in buying.
But.....
This forum has the history and the facts, especially with the Knife of the Week, Randall Questions, and general facts.
FB does not have a history and the same questions are asked frequently.
They each serve a different function in this current day.
I tried Instagram, but I do not see much organization with that platform, and do not have the patience to sit down and spend a lot of time trying to track various posters.