Filter the sharing title.
sharing_title
sharing_title-
filter -
filter sharing_permalinkFilter the sharing permalink.
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filter jetpack_open_sharing_in_new_windowFilter the way sharing links open. By default, sharing links open in a new window.
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action end_sharing_meta_box_contentFires after the sharing meta box content.
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action start_sharing_meta_box_contentFires before the sharing meta box content.
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filter sharing_meta_box_titleFilter the Sharing Meta Box title.
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filter sharing_meta_box_showFilter whether to display the Sharing Meta Box or not.
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action sharing_get_button_stateGet the state of a sharing button.
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filter sharing_default_globalFilters global sharing settings.
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filter sharing_services_enabledFilters the list of enabled Sharing Services.
Jetpack Developer Resources 