Like most websites, before Facebook rolls out a new feature, it employs what is known as A/B testing, where half of its users get access to a certain features on the site, while others get access to others. Whichever proves more popular gets implemented. Speaking to Bloomberg Businessweek, Facebook’s vice president of engineering, Mike Schroepfer, revealed that the company considered giving users the option to either “accept” a friend request or “reject” it. However, testing proved that the idea of rejecting a friend request was too stressful for most users, so the team went with the friendlier “not now” button.