Google indexes 35 trillion web pages. (Compare the volume with LinkedIn’s. LinkedIn profiles are 0.001% of Google’s Index!)
However, mining Google is not straightforward because the web has different kinds of pages. We can search for terms in the page titles, URLs, or links to the page but usually not for values like job titles or companies. If you want a reminder, here is The Full List of Google Advanced Search Operators.
Compared to, say, ten years ago, Google’s search has changed dramatically, not only adding trillions of pages but learning to recognize user’s intent when they are searching.