/** The list of Social Media options for the site
 * This is used to build Theme options to insert each Social Media link and to output it in the theme
 * @return array
 */
function ssa_social_media_options()
{
    return array(
        'facebook' => 'Facebook',
        'twitter' => 'Twitter',
        'instagram' => 'Instagram',
        'google-plus' => 'Google Plus',
        'linkedin' => 'LinkedIn',
        'play' => 'Youtube',
        'pinterest' => 'Pinterest'
    );
}

/**
 * Generate an array of the active Social Media links
 * To be active it must have been given a link in the Theme Options
 * @return array
 */
function ssa_social_media_active_icons()
{
    $active_sites = array();
    $social_sites = ssa_social_media_options();
    foreach (array_keys($social_sites) as $social_site) {
        if ($link = get_theme_mod($social_site)) {
            $active_sites[$social_site] = $link;
        }
    }
    return $active_sites;
}


<?php
/**
 * Theme Options
 * These are the theme options for adding the social links
 */
function ssa_options($wp_customize)
{
    $options = array(
        //Social Settings
        'social_settings' => array(
            'section' => array(
                'title' => __('Social Media Links', 'ssa'),
                'priority' => 103,
            ),
            'settings' => array()
        )
    );

    $social_sites = ssa_social_media_options();
    foreach ($social_sites as $key => $value) {
        $options['social_settings']['settings'][$key] = array(
            'setting' => array(
                'type' => 'theme_mod',
                'capability' => 'edit_theme_options',
                'sanitize_callback' => 'esc_url_raw'
            ),
            'control' => array(
                'label' => __($value, 'ssa')
            )
        );
    }
    ssa_customise_add_options($options, $wp_customize);
}
add_action('customize_register', 'ssa_options');
?>

/**
HTML template structure with hook to get social links
**/
 <div class="footer-block-social">
      <?php if ($active_sites = ssa_social_media_active_icons()) : ?>
          <?php foreach ($active_sites as $key => $value): ?>
              <div>
                  <a href="<?php echo esc_url($value); ?>" target="_blank">
                      <i class="<?php echo 'fa fa-' . $key; ?>" aria-hidden="true"></i>
                  </a>
              </div>
          <?php endforeach; ?>
      <?php endif; ?>
  </div>