Whether promotions are visible or not.
jetpack_show_promotions
jetpack_show_promotions-
filter -
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.
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filter jetpack_sync_send_data_query_argsFilters query parameters appended to the Sync request URL sent to WordPress.com.
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action jetpack_pre_theme_upgrade_translationsPre-upgrade action
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filter jetpack_wpcom_theme_deleteFilters whether to use an alternative process for deleting a WordPress.com theme. The alternative process can be executed during the filter. The filter can also return an instance of WP_Error; in which case the endpoint response will contain this error.
Jetpack Developer Resources 