You mean you are trying to bypass your country's internet filtering, which is a criminal offence to look at dubious material outlawed by your own government? Well, that is your business and the SPF forum cannot really help you with that as it would go against the forum rules.
However, concerning securing your own PC or home network from children accessing inappropriate and corrupting material like 'Social Media' sites we can discuss here. Though it might be better to post in one of the more dedicated SPF forums here if you want more than generic advice.
Like Alex said, usually either a hardware or software Firewall is implemented. Also an Access Control Lists are typically used on medium sized company routers to act as proxy servers blocking or allowing IP values that resolve to URLs for specific machines or networked groups. Typically they use a blacklist or white-list of sites, or words including wildcards, etc.
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