Allow filtering the default message that gets posted to Mastodon.
jetpack_sharing_mastodon_default_message
jetpack_sharing_mastodon_default_message-
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filter jetpack_sharing_tag_listAllow customizing how the list of tags is displayed.
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filter jetpack_sharing_data_attributesFilter the sharing data attributes.
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filter jetpack_recaptcha_valid_hostnamesAllow other valid hostnames. This can be useful in cases where the token hostname is expected to be different from the get_home_url (ex. AMP recaptcha token contains a different hostname)
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filter sharing_ajax_actionFilter the Sharing buttons’ Ajax action name Jetpack checks for. This allows the use of the buttons with your own Ajax implementation.
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filter jetpack_twitter_cards_image_defaultFilter the default Twitter card image, used when no image can be found in a post.
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filter wp_sharing_email_send_post_subjectFilter the Sharing Email Send Post Subject.
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filter sharing_services_emailFilters if Email Sharing is enabled.E-Mail sharing is often problematic due to spam concerns, so this filter enables it to be quickly and simply toggled.
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filter jetpack_sharing_headline_htmlFilter the sharing buttons’ headline structure.
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filter jetpack_open_graph_fallback_descriptionFilter the fallback `og:description` used when no excerpt information is provided.
Jetpack Developer Resources 