How To Detect Online Facebook User?

How reliable is the Facebook user ID payload within the Facebook Connect access_token?

I have a facebook connect app all set up using oauth and after the final transaction I receive an access_token that looks something like - 559514387926|f53be3fc76b8e243aaf2944b-502835064|moXh_HOIga8b32txRdwkan-5NW9. The part in bold seems to be facebook user id of the current user. I checked this with all the access_tokens of the users I have thus far and it matches in every case. Is there any documentation that states that this is a reliable way to obtain the facebook user id ? I know that <api_object>.get('me') is the best way to do so but I want to use the facebook user id directly to make leaner calls for existing users pulling only picture and pulling a lot more data for a first time user.
Answer:

http://stackoverflow.com/questions/3490170/does-the-facebook-connect-oauth-access-token-reliably-contain-the-facebook-user-i

Siddharth Batra at Quora Visit the source

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