Please help! How do I block social networking sites on my computer?

Someone using my computer has been on porn and social networking sites. I blocked the porn but does anyone know how to block the networking sites? Please help! How do I block social networking sites on my computer?
%26gt;%26gt; Open your browser tools. Once you have opened Internet Explorer, click on the ';Tools'; tab and then on the ';Internet Options'; tab.





%26gt;%26gt;Enable the Content Advisor. Once the ';Internet Options'; tab is opened, click on the word ';Content'; and then click ';Enable'; found under the title ';Content Advisor.';





%26gt;%26gt;From the ';Content Advisor'; click on the ';Approved Sites'; tab and enter the URL of the website you wish to block.


Click the ';Never'; tab and submit the change by adding a password you will be able to remember easily.





This is for internet explorer.Please help! How do I block social networking sites on my computer?
hello


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