       createdAt       : 'sparse'
       modifiedAt      : 'sparse'
       group           : 'sparse'
-
-    permissions       :
-      'read activity' :
-        public        : ['guest','member','moderator']
-        private       : ['member','moderator']
-
     sharedEvents      :
       instance        : []
       static          : ['BucketIsUpdated', 'cacheWorker'

          (signature Function)
          (signature Object, Function)
        ]
        captureSortCounts:
          (signature Function)
        fetchFacets:
          (signature Object, Function)
        checkIfLikedBefore:
          (signature [String], Function)
        count: [

  @on 'PostIsDeleted',     notifyCache.bind this, 'PostIsDeleted'
  @on 'BucketIsUpdated',   notifyCache.bind this, 'BucketIsUpdated'
  @on 'UserMarkedAsTroll', notifyCache.bind this, 'UserMarkedAsTroll'
