Any Ideas how to check that facebook user is a member of some group via API v 2.8 -

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i know impossible list of user groups in facebook. have ideas how check it, if have list of members of group(id, name)? example, person tries auth through facebook application, , after authorization , can link "www.facebook.com/app_scoped_user_id/{value}/". can suggest me way compare app_scoped_link , real user profile url?


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