Show Social Links For Users By ACF Plugin

<?php if( function_exists( "the_field" ) ): ?>
<p>
   Facebook Url: <?php the_field( "u_facebook","User_".get_the_author_meta( "ID" ) ); ?><br/>
   Twitter Url: <?php the_field( "u_twitter","User_".get_the_author_meta( "ID" ) ); ?><br/>
</p>
<?php endif; ?>