SEO Tip #92: How Precise Is the Number of Results In A Site: Query?
Matt Cutts: That’s a fantastic question. Let me share a little bit of trivia that not many people realize; site: queries attempt to estimate how many pages are in our index but we would never claim it as an exact amount that is completely accurate.
In fact let me just do a couple of queries and mention the number of results. Site:yahoo.com returns 138 million results and it says “about” 138
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