Allow listeners to listen for user local changes
jetpack_sync_user_locale
jetpack_sync_user_locale-
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action jetpack_sync_user_locale_deleteAllow listeners to listen for user local delete changes
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filter jetpack_photon_admin_allow_image_downsizeProvide plugins a way of running Photon for images in the WordPress Dashboard (wp-admin). Note: enabling this will result in Photon URLs added to your post content, which could make migrations across domains (and off Photon) a bit more challenging.
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filter jetpack_show_promotionsWhether promotions are visible or not.
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filter jetpack_format_theme_detailsFilter the array of theme information that will be returned per theme by the Jetpack theme APIs.
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filter jetpack_comment_form_display_greetingFilter whether the comment title can be displayed.
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filter jetpack_twitter_partner_idFilter the Twitter Partner ID.
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filter jetpack_sso_allowed_actionsAllows plugins the ability to overwrite actions where the SSO form is allowed to be used.
Jetpack Developer Resources 