ok guys, one more working week has finished (at least over here). Times by times we have to educate ourselves and even if many of us limit ourselves on youtube videos, there are many more sources of useful information. Is PageRank factor important for you? Then you must try to read following academic work by Massimo Franceschet: "PageRank: Standing on the Shoulders of Giants" http://goo.gl/EM6aO (pdf format) This article has been published in "Communications of the ACM" (Volume 54 Issue 6) -> magazine for the computing and information technology fields. Publication date: June 2011 short insight? np.. don't be afraid of mathematics - everybody will be able to get out something useful for himself / herself... yeah, have a good weekend p.s. don't forget to say TX