[Air-L] Looking for academically valid stats about the internet

Hi all !! I am currently trying to compile a set of data about internet usage and especially about the following list: -number of page indexed by google -number blogs in technorati -number à videos on youtube -number of article in wikipedia -nomber of user registered on facebook and on linkedin Do you know if there is a central doc that woud provide those stat ? if yes, is it, to your opinion, "academically usable"? Thank you in advance for your help... Jer'm -- Jeremy Depauw The Power of Knoweldge Sharing and Skills Synegism Journal de recherche: http://dev.ulb.ac.be/~jdepauw/dotclear/index.php