Véronis discovered something very interesting. About a third of the time, Google’s results include the Wikipedia link as the first link. His explanation is insightful:
How can this sudden interest in Wikipedia by both engines be explained? It is undoubtedly connected with the increasing difficultly engines have in calculating satisfactory ranking. The good old days of PageRank algorithms are over. (…) The explosion of blogs and news sites has changed the situation considerably.
If Web topology cannot cope anymore, this means we need to introduce time as a factor. Any taker on an hypergraph version of PageRank? How do you call a time-varying Markov process?