On 18 August 2010 12:12, wren ng thornton
Johan Tibell wrote:
To my knowledge the data we have about prevalence of encoding on the web is accurate. We crawl all pages we can get our hands on, by starting at some set of seeds and then following all the links. You cannot be sure that you've reached all web sites as there might be cliques in the web graph but we try our best to get them all. You're unlikely to get a better estimate anywhere else. I doubt few organizations have the machinery required to crawl most of the web.
There was a study recently on this. They found that there are four main parts of the Internet:
* a densely connected core, where from any site you can get to any other * an "in cone", from which you can reach the core (but not other in-cone members, since then you'd both be in the core) * an "out cone", which can be reached from the core (but which cannot reach each other) * and, unconnected islands
I'm guessing here that you're referring to what I've heard called the "hidden web": databases, etc. that require sign-ins, etc. (as stuff that isn't in the core, to differing degrees: some of these databases are indexed by google but you can't actually read them without an account, etc.) ? -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com