Reddit 's culture is enigmatic to many. The social news site started in 2005 as a place for people to find new and interesting things online. Today, the front page consistently tracks the unique and hottest stories by the hour.

The Reddit community has shifted from an intimate community of anonymous users to 35 million unique visitors per month.

Though anonymity is still a prominent part of the Reddit community, users have shown plenty of heart — from small gestures for the terminally ill to powerful social good for mainstream media

It's rather difficult to sum up all of Reddit — including its subreddits, community, controversy and culture. But PBS's web series Off Book interviewed co-founders Steve Huffman and Alexis Ohanian to explain, in less than 10 minutes, the power and allure of Reddit.