Wired Magazine stated that "nine blogs are created every minute and 2.3 content updates are posted every second"

a blog consists of generally at the very least 50 pages till you get the log in pages, and the settings and all that fun stuff, then if they are 2.3 content updates every second that changes a page unless it's a new post and not a comment making yet another page, and then there are billions and billions out there now,

as I type this there are probably over 20,000 new web sites being created.

There is absolutelly no way to tell, there is however a difference between a website and a web page

so as far as websites, if you really want to know how many there are you may be able to check on one of the sites that allows you to check for domain name registrations, although that changes all the time, and there are different servers in different worlds

I think you have asked one of the very few questions that is impossible to answer with accuracy