Add a member to a list. The authenticated user must own the list to be able to add members to it. Note that lists cannot have more than 5,000 members.
|The numerical id of the list.
|You can identify a list by its slug instead of its numerical id. If you decide to do so, note that you'll also have to specify the list owner using the owner_id or owner_screen_name parameters.
|The ID of the user for whom to return results. Helpful for disambiguating when a valid user ID is also a valid screen name.
|The screen name of the user for whom to return results. Helpful for disambiguating when a valid screen name is also a user ID.
|The screen name of the user who owns the list being requested by a slug.
|The user ID of the user who owns the list being requested by a slug.