When a friend of mine recently posted a photo to Instagram, he was disappointed to find that after a few hours, he had only received 12 Likes. He was quick to assign blame. “Girls always get more Likes than guys,” he said defensively. “You’re always Liking and commenting on each other’s photos. Guys don’t do that.” Of course, my friend wasn’t totally right — all kinds of people Like and comment on photos. But, after laughing at his accusation and looking back at who had Liked and...


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