Looking at that source, there's a pretty straightforward explanation of where the page views come from.
- Last month, Stack Overflow had ~142,575,642 visits.
- Last month, Google gave 127,896,508 visits to Stack Overflow
- Last month, Bing gave 7,491,274 visits to Stack Overflow
You could say that the Stack Overflow # of pageviews depends mainly on:
- How often people are searching Google/Bing for answer.
- How often Google/Bing rank Stack Overflow high enough for people to click into it.
- Last month, Stack Overflow had ~142,575,642 visits.
- Last month, Google gave 127,896,508 visits to Stack Overflow
- Last month, Bing gave 7,491,274 visits to Stack Overflow
You could say that the Stack Overflow # of pageviews depends mainly on:
- How often people are searching Google/Bing for answer.
- How often Google/Bing rank Stack Overflow high enough for people to click into it.