Some time you want to block facebook for a few hours, Twitter, Email for some hours on your computer to stop user of your computer to access these sites. Here i am going to tell you the step by which you can do that in two minutes .
I you are using the Google Chrome browser ,you just install the Google Chrome extension.
By using Google Chrome website Blocker extension you can block any website for desired time.You can also type an optional message.After blocking the site do the following things.
Now your desired websites are blocked and anyone will not know about this .