Hi there

The internet browser is not designed for graphics intense website or streaming.  I personally have found it either hit or miss.  Anything with Flash will NOT work.  Some websites have converted with HTML5 which may just work. 

Wouldnt have a clue on those websites that you listed.  If its absolutely crucial, I would be looking more at some type of Media Centre PC that connects to the TV instead of relying on an inbuilt browser on a TV - after all, its a TV and not a PC.

Cheers