Landscape and travel photographer James Popsys has noticed a troubling habit lately: he’s posting things “for the dopamine hit,” and he doesn’t believe he’s the only one. The result, says Popsys, is a “photographic groupthink,” caused by social media, that encourages people to post the same thing over and over, just because it’s popular. Popsys identifies the problem, primarily, on Instagram. “In the past two or three months, my Explore tab on Instagram has been made up of one thing:…