init

wp-content/plugins/jetpack/modules/comment-likes/admin-style.css

@@ -0,0 +1,45 @@
+.fixed .column-comment_likes {
+    width: 5.5em;
+    padding: 8px 0;
+    text-align: center;
+}
+
+.fixed .column-stats {
+    width: 5em;
+}
+
+.fixed .column-comment_likes .comment-like-count {
+    box-sizing: border-box;
+    display: inline-block;
+    padding: 0 8px;
+    height: 2em;
+    margin-top: 5px;
+    -webkit-border-radius: 5px;
+    border-radius: 5px;
+    background-color: #787c82;
+    color: #fff;
+    font-size: 11px;
+    line-height: 21px;
+}
+
+.fixed .column-comment_likes .comment-like-count:after {
+    border: none;
+}
+
+.fixed .column-comment_likes .comment-like-count:hover {
+    background-color: #2271b1;
+}
+
+.fixed .column-comment_likes .vers:before {
+    font: normal 20px/1 dashicons;
+    content: '\f155';
+    speak: none;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+}
+
+@media screen and (max-width: 782px) {
+    .fixed .column-comment_likes {
+        display: none;
+    }
+}

wp-content/plugins/jetpack/modules/comment-likes/comment-like-count.js

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+jQuery( document ).ready( function ( $ ) {
+	var jsonAPIbase = 'https://public-api.wordpress.com/rest/v1',
+		APIqueue = [];
+
+	function getCommentLikeCounts() {
+		$( '.comment-like-count' ).each( function () {
+			var blogId = $( this ).attr( 'data-blog-id' ),
+				commentId = $( this ).attr( 'data-comment-id' );
+
+			APIqueue.push( '/sites/' + blogId + '/comments/' + commentId + '/likes' );
+		} );
+
+		return $.ajax( {
+			type: 'GET',
+			url: jsonAPIbase + '/batch',
+			dataType: 'jsonp',
+			data: 'urls[]=' + APIqueue.map( encodeURIComponent ).join( '&urls[]=' ),
+			success: function ( response ) {
+				for ( var path in response ) {
+					if ( ! response[ path ].error_data ) {
+						var urlPieces = path.split( '/' ),
+							commentId = urlPieces[ 4 ],
+							likeCount = response[ path ].found;
+
+						if ( likeCount < 1 ) {
+							return;
+						}
+
+						$( '#comment-like-count-' + commentId )
+							.find( '.like-count' )
+							.hide()
+							.text( likeCount )
+							.fadeIn();
+					}
+				}
+			},
+			error: function () {},
+		} );
+	}
+
+	getCommentLikeCounts();
+} );