Safari randomy refusing connections on ML

Question

All of a sudden, Safari has decided it doesn't want to connect to google or Facebook or some random other pages.
I can connect to some pages but not others.
My bittorrent client works. I can ping apple and google, my iPhone can connect perfectly fine to any webpage while connected to my wifi network.
But some pages are refusing connections on my Mac Pro.

Answer 1

Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window:
curl -I http://www.apple.com
Press return. You should almost instantly get several lines of output below what you entered, the first of which begins with something like this:
HTTP/1.1
If there's no output within ten seconds, consider that a failure. You can then quit Terminal. Post your results.