Is there a reliable source for the latest number of page-views stackoverflow.com receives (not the Stack Exchange network, just that site)?
I need a source that I can cite on my research paper.
Perhaps the most accurate figure would be the one reported by Stack exchange itself.
For example, SO currently reports 5.5 million visits per day:
So, that would be roughly
5.5 * 365.25 / 12, or 167 million visits per month.
Caution: Stack Exchange reports "median" figures!? Median can be misleading for stats like this, as opposed to the mean or average.
Also note that sites link Quantcast, Alexis, and even Google analytics are blocked by many user's Adblock and script-blocking extensions. (The reported stats never agree with my server logs.)
Update: At last report (3 years ago), Jeff said that SE's traffic stats come from the Google Analytics API.
You can find aggregate traffic statistics for all Stack Exchange sites on Quantcast.
Here I introduce reliable statistics on quarterly # of pageviews per tag and question:
Source: Taking the archives that Stack Overflow produces quarterly - and doing the math between quarters.