Safari cannot open facebook, cannot find server.. why ?

Question

When I try to go to the facebook page, Safari cannot open it, says "Safari cannot find server"..."Safari cannot conect to server".. etc etc

Answer 1

Double-click anywhere in the line of text below on this page to select it, then copy it to the Clipboard (command-C):
www.facebook.com
Launch the Network Utility 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 Network Utility in the icon grid.
Step 1
Select the Lookup tab and paste into the address field (command-V). Press return. Post the output that appears below – the text, please, not a screenshot.
Step 2
Select the Ping tab and do the same. Please enter the same input as you did in Step 1. Don't use the output of Step 1 as input to Step 2.
Important Note
Some web browsers and mail clients will automatically convert a domain name such as "www.example.com" to a clickable URL, such as http://www.example.com. That will interfere with the test. If necessary, edit the input in the Network Utility window to remove any added characters.