The content filter we currently use is kept fully up to date by automatically adding filter lists to its database at least once a day.
Sites are also added or removed manually following requests from schools. All requests are thoroughly checked by a member of the Schools ICT Helpdesk before being added to the filter list.
As websites are categorised it is possible to allow schools access to certain websites which are normally blocked. This includes sites such as YouTube, Twitter and Facebook via the "staff whitelist", which allows access for specific static IP addresses (this depends on who your school's internet service provider is).