Revenue

OpenDNS is a service that with a few small changes to the network settings on your computer, you can get free protection and filtering on the internet. They now have over 500,000 registered accounts, but the amount of users is much higher than this because you don't have to register to use the service. You might be wondering where does all their money come from? While using their service you get access to their search features, and through this they make revenue from this pages, using Yahoo as a search service.