I'm confused between those 2 permissions. From the [Permissions Reference](https://developers.facebook.com/docs/authentication/permissions/#user_friends_perms), both permissions provide access to user's post/message. It seems that the read\_stream permission covers user\_status permission, since it provides access to all the posts (mean all message, checkin, status... and also the post that user's friend post on user's page). 

Can anyone provide more information for those permissions?
Thanks.