Facebook's Messenger Kids app has so far been strict about adding friends. Early on, it even required that children count their parents as friends. The social network is ready to loosen things up, however... if only a bit. It's giving its Android and iOS apps an optional feature that lets kids start friend requests. When you turn it on, Facebook creates a random four-word passphrase for your child -- they just have to provide that phrase to their potential Messenger Kids friend. Parents still have to approve requests, but this saves them from having to handle the entire process, and simplifies matters if they aren't friends with their young ones.