OptionalcountOptionaloffsetOffset needed to return a specific subset of mutual friends.
OptionalorderSort order: 'random' - random order
Optionalsource_ID of the user whose friends will be checked against the friends of the user specified in 'target_uid'.
Optionaltarget_ID of the user whose friends will be checked against the friends of the user specified in 'source_uid'.
Optionaltarget_
Number of mutual friends to return.