Artists and art dealers are finding ways to use more social media platforms to sell art as highlighted in this Forbes article
https://www.forbes.com/sites/zarastone/2017/09/19/how-a-26-year-old-artist-makes-40-of-sales-through-instagram/#25d35212192b

Like the markets for antique furniture, 19th century and Old Master paintings, the market for antique frames has seen an overall decline since 2008. Artsy provides an interesting look. ​https://www.artsy.net/article/artsy-editorial-history-frames-market

Read this in-depth article that reveals the fascinating details - How do you make an artist into a key figure of art history? 
​https://www.wsj.com/articles/how-anni-and-josef-albers-became-21st-century-art-stars-1504713775