5f5a5344_sources__Twitter_API_Changelog_eets_by_all_members_of_a_list__Description
[Resource] GET lists/subscriptions [Description] 
Obtain a collection of the lists the specified user is subscribed to, 20 lists per page by default. Does not include the user's own lists.
May 13, 2014 change on "REST API v1.1 Resources" Twitter API Changelog
Description