FB.Canvas.Prefetcher.setCollectionMode() controls how statistics are collected on resources used by your application. This method influences whether those resources are fetched to the browser early; it can also be used to turn off Prefetching completely.
This method takes one of two constants as a parameter:
FB.Canvas.Prefetcher.COLLECT_AUTOMATIC -- use default collection mode
FB.Canvas.Prefetcher.COLLECT_MANUAL -- fully manual
See the Prefetching section for an overview of this feature.
To completely control which resources are reported to Facebook, for a given page load
It is not necessary to call setCollectionMode to call addStaticResource; in automatic mode, Facebook will automatically infer what other resources you are using that are important to fetch early.