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A sharp-eyed tipster told Nick O’Neill at All Facebook that the social network has modified the metrics it uses to track user activity on developer applications.

Instead of reporting how many daily active users an application has, Facebook now reports its monthly active users. We’re not sure why this change was made, but Facebook spokesman David Swain said a blog post about the switch would be available later on Tuesday.

This is a fairly big deal for developers–though O’Neill speculates they may be able to get daily stats internally–and pretty much insignificant for users, unless they were totally picky about knowing exactly how many people were using their favorite apps every day. One developer who spoke to CNET News said monthly stats will probably be a plus for him, if only because it means his application will have a 22,000 next to it rather than a 1,500.

It does deal a blow to Adonomics, a start-up that tracks daily use of Facebook applications. That company’s business model is now uncertain.