What endpoint do I hit for this Facebook API?

http://developer开发者_运维技巧s.facebook.com/docs/authentication/permissions/

"user_online_presence"

What endpoint do I hit? I want to know what users are online.

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Just redirect user to

https://www.facebook.com/dialog/oauth?client_id=YOUR_APP_ID&redirect_uri=YOUR_URL&scope=user_online_presence

In documentation: http://developers.facebook.com/docs/authentication/