There’s an easier way – just edit the single.php file and add the code in bold, replacing ‘your-class-name’ with whatever you want to name the class for the div so you can style it. I used it to add a little margin to the top of the social icons:
<div class="post-info">
<div class="author-name"><span><?php _e("Posted by", "swiftframework"); ?></span>"><?php the_author_meta('display_name'); ?> on <?php echo $post_date; ?></div>
<div class="your-class-name"><?php echo do_shortcode('[social size="small" style="colour" type="twitter,flickr,facebook,pinterest"]'); ?></div>
</div>
.