This is a simplest facebook login button which will also fetch basic profile information along with email.

Use below steps to implement in your application

• You just have to add depedency in your application
• Drag & drop FBLoginButton block to you screen
• Pass required parameters (get it from your facebook app)
• Keep redirect url as where block is placed
• add a data action on screen and check if code input parameter exists then call GetProfileData server action from component, it will return profile information like name, email & fb user id

You can find complement implementation on below forge

https://www.outsystems.com/forge/Component_Overview.aspx?ProjectId=7329