In general, people who share [awe-inspiring articles] seem to have loftier motives than trying to impress their friends. They’re seeking emotional communion, Dr. Berger said.
“Emotion in general leads to transmission, and awe is quite a strong emotion,” he said. “If I’ve just read this story that changes the way I understand the world and myself, I want to talk to others about what it means. I want to proselytize and share the feeling of awe.
This is essentially why I share things on Tumblr. =)