Question: I was wondering if it is possible to extract the facebook account assigned to the windows phone, I would like to have access to the user name, picture and friends name, pictures (which are stored in the People of WP7).
This would be done in C#.

Thanks

Answer: 
You can get the name and photo of friends if the user has logged into their facebook account. You just can't get the account name and picture of the facebook login.

See <http://msdn.microsoft.com/en-us/library/hh202972(v=vs.92).aspx>
There is no way to access this information unfortunately.