videopress_get_video_detailsAllow functions to modify fetched video details. This filter allows third-party code to modify the return data about a given video. It may involve swapping some data out or adding new parameters.
jetpack_supported_media_sideload_typesFilter the list of supported mime types for media sideloading.
jetpack_photon_srcset_multipliersFilter the multiplier Photon uses to create new srcset items. Return false to short-circuit and bypass auto-generation.
jetpack_markdown_preserve_patternAllow third-party plugins to define custom patterns that won’t be processed by Markdown.
jetpack_user_authorizedFires after user has successfully received an auth token.
jetpack_open_graph_fallback_descriptionFilter the fallback `og:description` used when no excerpt information is provided.
Jetpack Developer Resources 