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Cómo bloquear algunos sitios en la computadora
(for Windows PCs):
Step 1: Click the Start button and select Run. Now type the following text in that Run box:
notepad c:\WINDOWS\system32\drivers\etc\hosts
Step 2: You will see a new notepad window on your screen containing some cryptic information. Don’t panic. Just goto the last line of the file, hit the enter key and type the following:
127.0.0.1 orkut.com
127.0.0.1 facebook.com
127.0.0.1 myspace.com
Save the file and exit. That’s it. None of the above sites will now open on your computer.
vía How Parents Can Block Certain Websites from Children at Home.