     for activity in activities when activity.bongo_.constructorName in @getFilter()
       @listController.newActivityArrived activity
 
+  # Store first & last activity timestamp.
+  extractTeasersTimeStamps:(teasers)->
+
+    teasers  = _.compact(teasers)
+    lastTo   = teasers.first.meta.createdAt
+    lastFrom = teasers.last.meta.createdAt
+
+  # Store first & last cache activity timestamp.
+  extractCacheTimeStamps: (cache)->
+
+    lastTo   = cache.to
+    lastFrom = cache.from
+
   populateActivity:(options = {})->
 
     return if isLoading

            @listController.hideLazyLoader()
            @listController.noActivityItem.show()
          else
            lastTo   = cache.to
            lastFrom = cache.from

            log lastTo, lastFrom

            @sanitizeCache cache, (err, cache)=>
              @listController.hideLazyLoader()

            warn err
            @listController.noActivityItem.show()
          else
            @extractTeasersTimeStamps(teasers)
            @listController.listActivities teasers

      else
