Filter the default Publicize message.
wpas_default_message
wpas_default_message-
filter -
filter wpcom_markdown_transform_postFilter the content to be run through Markdown, after it was transformed by Markdown.
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filter wpcom_markdown_transform_preFilter the content to be run through Markdown, before it’s transformed by Markdown.
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filter content_save_preThis filter is already documented in core/wp-includes/default-filters.php
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filter wpcom_untransformed_contentFilter the original post content passed to Markdown.
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filter easy_markdown_support_urlFilter the Markdown support URL.
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filter subscribe_field_idFilter the subscription form’s ID prefix.
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filter jetpack_auto_fill_logged_in_userAllow third-party tools to prefill the contact form with the user’s details when they’re logged in.
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filter jetpack_comment_cookie_domainFilter the Jetpack Comment cookie domain.
Jetpack Developer Resources 