The service is provided by third-party advertisement hubs, which facilitate real-time bidding for advertisers.1 yearHTTPiOpenxRegisters anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.1 yearHTTPmcQuantcastCollects data on the user's visits to the website, such as what pages have been loaded.