Well any site can make their own version of steemit content. It's all there to mine from the blockchain. I think it would be truly impossible to know how much a post was viewed if you want to account for all the other sites.
Steemit.com can certainly be considered the main site and I would be happy just to see some analytics from them. I think it will be a while though. I mean profile pics aren't even enabled yet we've got a long way to go.