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The Login button is a simple way to trigger the Facebook Login process on your website or web app If someone hasn't logged into your app yet, they'll see this button, and clicking it will open a Login dialog, starting the login flowConnectezvous à Facebook pour commencer à partager et communiquer avec vos amis, votre famille et les personnes que vous connaissezRegisters a login callback to the given callback manager public void registerCallback(CallbackManager callbackManager, FacebookCallback callback) Parameter Description callbackManager The callback manager that will encapsulate the callback callback The login callback that will be called on login completion My Fb Account Now Logout I Need Login But No Password Facebook login logout button