If you want to do better than a reasonable estimate, it becomes a lot more complicated, a real brain teaser. Google wants to give us search results that best meet our wishes and expectations, that we find most relevant. Google thereby implicitly learns from our knowledge, which we as humans use to evaluate and assess answers. This makes Google our greatest common denominator. Is that wise? At the moment, it is the best we have to make the endless amount of information on the internet manageable. And Google tries to do that as wisely (and commercially) as possible. A company like Google knows that better than anyone.
Google tries to make as much information on the internet searchable as possible, china phone number list so that it can give us as users the most relevant answers to our questions. Google uses the wisdom of crowds, among other things, by looking at how often a certain page is referred to by other websites. Websites with many cross-references are more relevant and end up higher in the search results. But Google's ingenious algorithm looks at more things: certain 'respected' sources are given greater weight than others, groupthink is corrected and Google tries to prevent websites that try to end up artificially high or other pollution. Google then learns from our feedback: which search result is clicked on first and how can this end up even higher next time, preferably at number one. The algorithm that Google uses is as secret as it is complex.