Many mobile games have Facebook button. What is it most commonly used for?
I believe some games are using Facebook leaderboards and can show your friends scores. Some games can post messages on your wall.
Are there any other reasons why I should ask players to login to Facebook?
I don't plan to publish my game on Facebook and I'll be using Google Play or Appstore leaderboards.
Also I want to add a "generic" share button that can share scores to various social networks.
So do I need this Facebook button?