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News streams that have been created for specific people and/or All registered users do not have the option to be removed or unfollowed by users. Users will always see those streams when they go to the News page. This document provide more information around the news feature https://community.jivesoftware.com/docs/DOC-145072#jive_content_id_Creating_an_AudienceSpecific_News_Stream
In regards to the metrics, our impact metrics displays who has viewed the content but does not provide details pertaining to the device/platform used.
Hope this helps.
Thanks for your answer, yes it helps a lot!