title: Difference between read_stream and user_posts permissions in v2.2
body: <p>We are trying to track how well posts generated from our platform are doing in terms of like and comment count. We understand that read_stream isn't going to be an option, but we noticed there's a user_posts permission which is supposed to let us get posts that the user posted or is tagged in.</p>
  
  <p>While testing it seems sort of spotty when the likes/comments are returned with this other permission. Does anyone know what the differences between these 2 permissions are and what data we should be able to get?</p>