Facebook, youtube, and some other sites doesn't work on Mountain Lion

Since I installed Mountain Lion (today) i can't acess facebook, youtube videos and some other sites. I thought the problem was the flash player so i've tryed uninstall and reinstall, desable and enable, and read some tips that didn't work until now. Hope you can help me =)

Found the answer myself, its a commun problem in Mountain Lion. Some guy found the way to make flash work well. Maybe some of you just need to install the latest version. But the truth is there is a bug and this is how to fix it:
System Preferenes > Network > Wi-Fi or Ethernet (whatever you're using) > Advanced > Hardware > Set 'Configure = Manually' > Change 'MTU = Custom' = 1380

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