According to a 2017 survey done by the National Association of Realtors, 51% of buyers found the home they purchased through the internet; that number has probably grown in the past few years.
Images play a pivotal role when selling a real-estate - buyers get a glimpse of their prospective new homes and decide whether they are going to buy it or not. Therefore, there's even more responsibility on the shoulders of real-estate agents if they publish their work on a social networking site that deals mainly with images.