Can be used to prevent SEO tools from modifying site titles.
jetpack_seo_custom_titles
jetpack_seo_custom_titles-
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filter jetpack_seo_meta_tags_enabledCan be used to prevent SEO tools from inserting custom meta tags.
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filter jetpack_seo_custom_title_conflicted_themesCan be used to specify a list of themes that use their own custom title format. If current site is using one of the themes listed as conflicting, Jetpack SEO custom title formats will be disabled.
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filter jetpack_seo_front_page_description_max_lengthCan be used to limit the length of front page meta description.
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filter jetpack_sharing_headline_htmlFilter the sharing buttons’ headline structure.
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filter jetpack_sync_error_idc_validationFilters whether the sync_error_idc option is valid.
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filter jetpack_auth_typeFilter the type of authorization. ‘calypso’ completes authorization on wordpress.com/jetpack/connect while ‘jetpack’ ( or any other value ) completes the authorization at jetpack.wordpress.com.
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filter jetpack_idc_non_admin_contact_admin_textAllows overriding of the default text that is displayed to non-admins prompting them to contact an admin.
Jetpack Developer Resources 