Adds multiple members to a list, by specifying a comma-separated list of member ids or screen names. The authenticated user must own the list to be able to add members to it. Lists are limited to having 500 members, and you are limited to adding up to 100 members to a list at a time with this method.
Supported request methods
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A comma separated list of user IDs, up to 100 are allowed in a single request.
A comma separated list of screen names, up to 100 are allowed in a single request.