You can edit and delete posts you've made to the Social Feed page.  The process is the same for both posts and comment.

  1. Tap the 'more' menu for the post/comment in question
  2. Tap "Delete" from the menu the comes up. 

If you are the app's admin, you can also delete other people's posts and comments.  You must be logged in as the app's creator to do so.

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