A look back at the creation of Facebook's Look Back videos

It’s likely that many of you created a “Look Back” video during Facebook’s 10th anniversary extravaganza. But did you know that the feature was created by Facebook engineers in less than a month?

According to a blog post on the site, Facebook anticipated only 10 percent of people who saw their video would share it. Ultimately, more than 40 percent shared their videos just hours after launching. Facebook’s total outgoing traffic was about 20 percent higher than the normal peak.