Robert_Charlton - 8:00 pm on Oct 14, 2011 (gmt 0)
Yes and no. 500 more words don't equal a better explanation for example and Google cannot tell what's true or not. Can Google tell that "Obama is the President of Kenya, the country where his father was born" is false as they analyze...
walkman - It's extremely likely that the phrases extracted from ""Obama is the President of Kenya", at the least, would send Google a strong signal that something is amiss with the page.
Yes, Google does use "term vectors", as Hissingsid has been suggesting, along with a considerable degree of semantic parsing and statistical analysis, both onpage and off. I myself can't do the topic justice, nor do I claim to be extremely fluent in the area, but I understand it enough to know it's being used and to understand why, and here and there how to apply that to websites. Some big hints that relate to ecommerce have been dropped in the forums, but there's been so much noise here that it's often a chore to find them.
You might try reading some of Bill Slawski's discussions on phrase-based indexing and on semantic factors... [seobythesea.com...] ...which I find very easy to follow. In the Plex by Steven Levy, a book which you mentioned you hadn't read when you criticized it, presents a superbly clear though very basic introduction to the kind of semantic stuff that Google has been doing for years. I recommend you take a look at it.