Full of Inhabitants

I am not very knowledgeable on spiders that live in sheet webbing and in these tangled web structures. This one was full of tiny spiders. I don’t know if they are a social species of if this is an elaborate egg sac and all the spiderlings have hatched. I.D. help is, as always, much appreciated. Found in bushland in East Blaxland, Blue Mountains, NSW.

Done