Filter the default Open Graph image alt text, used when the Open Graph image from the post does not have an alt text.
jetpack_open_graph_image_default_alt_text
jetpack_open_graph_image_default_alt_text-
filter -
filter jetpack_podcast_helper_tracks_quantityAllow requesting a specific number of tracks from SimplePie’s `get_items` call. The default number of tracks is ten.
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filter jetpack_build_connection_urlFilter the URL used when connecting a user to a WordPress.com account.
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filter jetpack_update_activated_state_on_disconnectFilters whether the Jetpack activated state should be updated after disconnecting.
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filter jetpack_is_connection_readyAllows filtering whether the connection is ready to be used. If true, this will enable the Jetpack UI and modules Modules will be enabled depending on the connection status and if the module requires a connection or user connection.
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action jetpack_loadedFires when Jetpack is fully loaded and ready. This is the point where it’s safe to instantiate classes from packages and namespaces that are managed by the Jetpack Autoloader.
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filter jetpack_connection_ui_activeFilter to activate Jetpack Connection UI.INTERNAL USE ONLY.
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filter jetpack_sso_login_form_explanation_textFilter the messeage displayed below the SSO button.
Jetpack Developer Resources 