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Interesting point, how do you measure "usage" of a Facebook App? Most of the things I see just take up space on the user profile and display random bits of information (like top friends, ilike, etc). So I'm guessing the number of users are simply the number of people that have the app installed. Is there a good way to measure usage?
Facebook provides a count of "daily users," which would be a pretty decent measure of usage.
Daily active users is based on "touch points".

Touch points are:

Canvas Page Views

Link Clicks in FBML

Mock-Ajax Form Submission

Click-to-Play Flash

So Facebook requires some kind of daily interaction for a user to be counted.