Filter the Gravatar Hovercard PHP callbacks.
grofiles_hovercards_data_callbacks
grofiles_hovercards_data_callbacks-
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filter jetpack_portfolio_thumbnail_sizeChange the Portfolio thumbnail size.
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filter portfolio-project-post-classFilter the class applied to project div in the portfolio
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filter the_contentThis filter is already documented in core. wp-includes/post-template.php
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filter jetpack_testimonial_thumbnail_sizeChange the thumbnail size for the Testimonial CPT.
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filter testimonial-entry-post-classFilter the class applied to testimonial div in the testimonial
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filter jetpack_enable_cptAllow something else to hook in and enable this CPT.
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action jetpack_holiday_snow_option_updatedFires when the holiday snow option is updated.
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filter jetpack_is_holiday_snow_seasonFilter whether it’s winter or not.You can use this filter if, for example, you live in the Southern Hemisphere. In that case, the dates for winter above are incorrect for your location.
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filter jetpack_holiday_snow_option_nameFilter the holiday snow option name.
Jetpack Developer Resources 