Display posts by views using Jetpack plugin data, tutorial here: http://zoerooney.com/blog/tutorials/top-posts-by-page-views/ (publish date: 5/16)

full-snippet.php

<?php if( function_exists( 'stats_get_csv' ) ) :
    $top_posts = stats_get_csv( 'postviews', array( 'days' => 21, 'limit' => -1 ) );
    $top_ids = array();
    foreach ( $top_posts as $top_post ) {
    	$top_ids[] = $top_post['post_id'];
    }
    
    // Check for transient, hat tip Greg Rickaby
    if ( false === ( $tops = get_transient( 'popular_posts' ) ) ) :
			    	
    	$top_args = array(
    		'post_type' => 'post',
    		'post__in' => $top_ids,
    		'posts_per_page' => 14
	 );
	 $tops = new WP_Query( $top_args );
    
    	// Store transient and expire after 24 hours
    	set_transient( 'popular_posts', $tops, 24 * HOUR_IN_SECONDS );

    endif; 
    
    if ( $tops->have_posts() ) : ?>
	    <div id="top-posts-area" class="top-posts-area">
	    	<div class="top-carousel carousel">
	    	<?php while ( $tops->have_posts() ) : $tops->the_post(); ?>
		    	<a class="carousel-item" href="<?php the_permalink(); ?>">
		    		<?php the_post_thumbnail('thumbnail'); ?>
		    		<div class="caption">
		    			<h3><?php the_title(); ?></h3>
		    		</div>
		    	</a>
	    	<?php endwhile; ?>
	    	</div>
	    </div>
    <?php endif; wp_reset_postdata();
endif; ?>

top-posts.php

$top_posts = stats_get_csv( 'postviews', array( 'days' => 21, 'limit' => -1 ) );
$top_ids = array();
foreach ( $top_posts as $top_post ) {
	$top_ids[] = $top_post['post_id'];
}

wp-query-args.php

// Check for transient, hat tip Greg Rickaby
if ( false === ( $tops = get_transient( 'popular_posts' ) ) ) :
			    	
    $top_args = array(
    	'post_type' => 'post',
    	'post__in' => $top_ids,
    	'posts_per_page' => 14
    );
    $tops = new WP_Query( $top_args );
    
    // Store transient and expire after 24 hours
    set_transient( 'popular_posts', $tops, 24 * HOUR_IN_SECONDS );

endif; 

wp-query-loop.php

if ( $tops->have_posts() ) : ?>
<div id="top-posts-area" class="top-posts-area">
	<div class="top-carousel carousel">
	<?php while ( $tops->have_posts() ) : $tops->the_post(); ?>
	<a class="carousel-item" href="<?php the_permalink(); ?>">
		<?php the_post_thumbnail('thumbnail'); ?>
		<div class="caption">
			<h3><?php the_title(); ?></h3>
		</div>
	</a>
	<?php endwhile; ?>
	</div>
</div>
<?php endif; wp_reset_postdata();