Bob, thanks for starting this discussion, which has generated lots of good insights on the need for marketing our work in different ways. With so many social (time consuming) options available--Pinterest, Facebook, Etsy, blogs, websites, Instagram, etc.--settling on a combination that works makes sense to me. Finding that combination does take time, research, and effort.
I post my artwork on Facebook, but I don't use that venue to "market" my work. It is a good way for me to let people know what I'm doing, though. I'm starting to use Instagram, and I have a blog that directs people back to DPW if they want to buy a painting. Instagram doesn't take a lot of time and the posts are relevant for as long as I keep my account active. I'm also reading a book on how to use Instagram for marketing. And I'm active on Pinterest, but I think I could learn to use that platform to better advantage.
I'm also starting to think there might be some advantage to increasing visibility where I live. I do primarily landscape, and local people are apt to be more interested in what I paint. I might make finding a couple of places to display my artwork a goal for 2016.