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You can block facebook and other sites in single computer using host file.
Click start and then click on run and type following
notepad c:windowssystem32driversetchosts
Once notepad is open you can edit the file. We will block Facebook in this example. For this just enter in the following after the # mark.
0.0.0.0 http://www.facebook.com
After editing the file don’t forget to save it .
Now check if we try to access Facebook in IE. You can’t get to the page.