uxzentrisch zitiert:

The BBC intranet used to analyze its top searches and then place the Top 10 on the homepage and other relevant pages. Once people could now easily find this Top 10, they stopped searching for them. So, over time, a new top 10 search queries emerged. And this caused a vicious circle because once they replaced the ‘old’ Top 10 with the ‘new’ Top 10, the old top 10 started getting searched for again.

Gerry Mc Govern. The changing nature of search behavior