More Easier Internet Filtering -- At the DNS Level
Sometime back we saw about 'Three Best Software' to filter out bad websites in our home networks. People who are wary about installing extra software can choose to use OpenDNS, a free DNS solution whilst accessing the Internet. The only thing required is to signup for an account and to route our system's nameserver requests through their nameservers. When a particular website is found to be a bad website their nameservers automatically routed to the blocked page. They even support customizing the blocked pages with our logo.
For businesses they have cost-effective and proven plans which could be explored too. An example block page is given below:
Now even if you type an incorrect URL their name servers would help you locate the correct URL.