What user stats do you keep and share?
The only users stats we track are the "views" of items on the site.
Where are the stats?
For collections they are viewable in a chart form in the "About" tab on a collection page. These numbers represent views in all the items in that collection. These are updated daily. For items they are shown on the right side of the details page. These are updated daily. Search results pages also show the "views" to the left of the page title. These numbers may differ from those on item and collection pages because they are updated monthly rather than daily.
What is a "view"?
A "view" used to be called a "download" on archive.org. How are "views" counted?
archive.org calculates a view as: one action (read a book, download a file, watch a movie, etc.), per day, per IP Address. So, for each item page, using multiple files or accessing from multiple accounts in a single day will only count as one view.
How often are views counted?
Item pages are updated daily so the current number would reflect the count through the previous day. Collection counts shown in the graph on the "About" page are updated monthly.
Other Internet Archive stats links
Aggregated operational stats are viewable at archive.org/stats