If a free hosting service begins to show patterns of spam, we make a strong effort to be granular and tackle only spammy pages or sites. However, in some cases, when the spammers have pretty much taken over the free web hosting service or a large fraction of the service, we may be forced to take more decisive steps to protect our users and remove the entire free web hosting service from our search results. To prevent this from happening, we would like to help owners of free web hosting services by sharing what we think may help you save valuable resources like bandwidth and processing power, and also protect your hosting service from these spammers
Publish a clear abuse policy and communicate it to your users
In your sign-up form, consider using CAPTCHAs
Try to monitor your free hosting service for other spam signals
Keep a record of signups and try to identify typical spam patterns
Keep an eye on your webserver log files for sudden traffic spikes
Try to monitor your free web hosting service for phishing and malware-infected pages.
Come up with a few sanity checks. For example, if you’re running a local Polish free web hosting service, what are the odds of thousands of new and legitimate sites in Japanese being created overnight on your service?