Function: Get a count of a user’s friends who can be invited to a given group.

Function: Search the friends of a user by a search string.

Function: Get a list of IDs of users who have requested friendship of a given user.

Function: Get a user’s most recently active friends.

Function: Get a user’s friends, in alphabetical order.

Function: Get the IDs of a given user’s friends.

Function: Check whether a given user has any friends.