http://www.wpquestions.com/question/show/id/7077

sidebar.php

<?php if ( !is_singular(array('exhibitor', 'features', 'zones'))) {
	
	$currentID      	= get_the_ID();
	$exhibitorMeta      = new WP_Query(array(

		'post_type'		=> 'exhibitor',
		'post_id'       => $currentID ,
		'meta_query' 	=> array(
		
			'relation' 	=> 'OR',

				array(
				
		            'key' => 'Facebook Page',
		            'value' => '',
		            'compare' => '!='
		            
            	),

			 	array(

		            'key' => 'Twitter User',
		            'value' => '',
		            'compare' => '!='

            	),
            	
				 array(
	
	            	'key' => 'Web Address',
	            	'value' => '',
	            	'compare' => '!='
	
	            ),

			 	array(

            		'key' => 'E-mail Address',
            		'value' => '',
            		'compare' => '!='

            	),

				 array(
	
	            	'key' => 'Stand Number',
	            	'value' => '',
	            	'compare' => '!='
	
	            ),
	
				 array(
	
	            	'key' => 'Hall Number',
	            	'value' => '',
	            	'compare' => '!='
	
	            )

          	)

	));
		
if ($exhibitorMeta->have_posts()) : ?> 

	<?php if (  get_post_meta($post->ID, 'Facebook Page', true) ||
				get_post_meta($post->ID, 'Twitter User', true) ||
				get_post_meta($post->ID, 'Web Address', true) ||
				get_post_meta($post->ID, 'E-mail Address', true) ||
				get_post_meta($post->ID, 'Stand Number', true) ||
				get_post_meta($post->ID, 'Hall Number', true) ) { ?>
	
		<div class="module sidebar">
			
			<div class="module-head">
		
				Exhibitor Info
	
			</div>
			
			<div class="module-body exhibitor-meta">
			
				<ul>
				
				<?php if (  get_post_meta($post->ID, 'Facebook Page', true) ) echo '
					<li><a class="exhibitor-meta-icon-facebook" href="' . get_post_meta($post->ID, 'Facebook Page', true) . '" target="_blank">View our Facebook Page</a></li>
				'; ?>
				<?php if (  get_post_meta($post->ID, 'Twitter User', true) ) echo '
					<li><a class="exhibitor-meta-icon-twitter" href="' . get_post_meta($post->ID, 'Twitter User', true) . '" target="_blank">Follow us on Twitter</a></li>
				'; ?>
				<?php if (  get_post_meta($post->ID, 'Web Address', true) ) echo '
					<li><a class="exhibitor-meta-icon-web" href="' . get_post_meta($post->ID, 'Web Address', true) . '" target="_blank">View Website</a></li>
				'; ?>
				<?php if (  get_post_meta($post->ID, 'E-mail Address', true) ) echo '
					<li><a class="exhibitor-meta-icon-email" href="mailto:' . get_post_meta($post->ID, 'E-mail Address', true) . '" title="' . get_post_meta($post->ID, 'E-mail Address', true) . '" target="_blank">' . get_post_meta($post->ID, 'E-mail Address', true) . '</a></li>
				'; ?>
				<?php if (  get_post_meta($post->ID, 'Stand Number', true) || get_post_meta($post->ID, 'Hall Number', true) ) echo '
					<li><a class="exhibitor-meta-icon-stand" href="" target="_blank">' . get_post_meta($post->ID, 'Stand Number', true) . ', Hall ' . get_post_meta($post->ID, 'Hall Number', true) . '</a></li>
				'; ?>
				
				</ul>
			
			</div>
			
			<div class="module-foot"></div>
		
		</div>
		
	<?php } ?>

<?php unset($exhibitorMeta); endif; wp_reset_query(); } ?>