'Similar to the AggregatedActivity.add_many
The only difference is that it denormalizes a count of unseen activities'

def add_many(self, activities, **kwargs):

    with self.redis.lock(self.lock_key, timeout=2):
        current_activities = AggregatedFeed.add_many(self, activities, **kwargs)
        self.denormalize_count()
        return current_activities
