You can buy parental contol software, or for a large (5+) network of computers you can set up a proxy.
Netiquette
Local Cyber police is moderating Online content all the time. As you can with the recent National Security Agency leak they do moderate a lot of stuff online and know when you are breaking the law online.
Generally the producers of the site moderate the behavior, and with most every website there is a way to report someone who has harassed you online On facebook, with any comment or post, there is a "flag" button next to or under it. When you press it, it gets someone reported to the authorities.
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netiquette
The order it online but they get some of it out town
It depends on the processor, but 3.0 Ghz (using a P4, say), should be adequate for moderate gaming online.
Go to Mindlessbehavior.com and click on mindless behavior info and that is how you say happy birthday to mindless behavior omline