permission allows your app to publish posts, comments and like Pages managed by the app user. The allowed usage for this permission is to let app users to explicitly publish content from your app to any of the Facebook Pages they manage from within a custom composer, and to Like and comment from your app on behalf of the Pages app users manage. Note:
Requires the manage_pages
permission to work correctly. You may also use this permission to request analytics insights to improve your app and for marketing or advertising purposes, through the use of aggregated and de-identified or anonymized information (provided such data cannot be re-identified).