L on www.patient.co.uk
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About this cookie’s host: This domain is owned by Facebook, which is the world's largest social networking service. As a third party host provider, it mostly collects data on the interests of users via widgets such as the 'Like' button found on many websites. This is used to serve targeted advertising to its users when logged into its services. In 2014 it also started serving up behaviourally targeted advertising on other websites, similar to most dedicated online marketing companies.
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