You'd think there were all same, but apparently not so. You can see the structure of the RSS feed is different between, say, diablofans and hearthpwn:
Hearthpwn:
http://www.hearthpwn.com/news.rss
Diablofans:
http://www.diablofans.com/rss/forums...ome-page-news/
They're owned by the same parent company (Curse), but that's where the similarities end. Probably run by completely different tech stacks and servers.