The Login Button is a simple way to trigger the Facebook Login process on your . FB. login () as described in the Facebook Login for the Web documentation. The Login Button is a simple way to trigger the Facebook Login process on your . FB. login () as described in the Facebook Login for the Web documentation. Erstelle ein Konto oder melde dich bei Facebook an. Verbinde dich mit Freunden, Familie und anderen Personen, die du kennst. Teile Fotos und Videos. For more information, see Migration. Login Dialog Calling FB. People who have already logged in won't see any button, or you xfireskills also choose to video slots holland casino a logout button to. An example of such code:. For apps that want to use their own button, you can invoke the Login Dialog with a simple call to FB. Old Button Old Height New Button New Height Icon 18 px Deprecated Deprecated Small 18 px Small 20 px Medium 22 px Small 20 px Large 25 px Small 20 px XLarge 39 px Small 20 px. You can use this as the starting point for your own app, but it will be useful to read on and understand what is happening in the code above. If you show a logout button, when people use it to log out, they log out both from your app and from Facebook. Be respectful of those expectations when using this button. A signed parameter that contains information about the person using the app. Consider the 3 scenarios below:.