I got a request this past week from asking me to share a link to the their website, specifically their feature page on Robert Frank.  I wasn't too familiar with Artsy so I looked in to them first, they are basically a clearing house for art on the internet, collecting information from all over and having it in one place. They are definitely worth checking out and I even added their mobile app to my phone.  Below is the link to their Robert Frank page and I have their main page in my Links page now as well.