Nowadays Facebook is the most popular social media network. 'Easy to use' or Simplicity, easy to chat are the reasons behind this popularity. Facebook helps to find and follow peoples easily. In twitter, it is very difficult to get followers, but can follow others easily.
In Facebook, if we sent a friend request to someone, and if he accept our request, then both become friends, that means both are following each other, so we can see his posts on our timeline also vise verse.