The social network detailed the new requirements in a post on its developer blog:
- Apps that use icons that do not fill the entire space should use a transparent background.
- App category is now a required field to make it easier for us to surface apps in App Center and search.
- During the Open Graph submission process, we now require that you include at least two screenshots of the in-app user flow and one screenshot of what your action will look like when published to timeline.
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