Is there any way to stop users from posting messages to #everyone in newsfeed and allow only to view.
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With a little permissions tweak Newsfeed can be made read-only.
Un-check NewsFeed participation in Edit permissions page to stop posting messages.
Here you can find more information: http://www.n8d.at/blog/allow-users-with-view-permission-add-entries-to-the-newsfeed/