BBC News

For news I like to read the BBC. In addition to decent world news, they track and show what people have been searching for on their site. They also have a fun (if you like celeb 'news') feature called celebdaq (http://www.bbc.co.uk/celebdaq/) where people rate celebrities and it is tracked like a stock with their value going up and down.

I am curious about how often the information is updated on these sites that track and show you what other people have searched. Is it updated after every search or do they tally up a particular time range? Meaning, do they take a 24 hour timeshot and report what the top searches were for that day?