Send a social media icon click event to GA using MonsterInsights gtag.js API.

send-social-click-to-ga-1209416.html

<!-- Example HTML -->
<p>
  <a 
     href="https://www.facebook.com" 
     onclick="sendSocialClick1209416('Facebook', 'https://streetphotography.blog');"
     target="_blank" 
     rel="noopener">
    Facebook
  </a>
  &nbsp;•&nbsp;
  <a 
     href="https://twitter.com" 
     onclick="sendSocialClick1209416('Twitter', 'https://streetphotography.blog');" 
     target="_blank" 
     rel="noopener">
    Twitter
  </a>
  &nbsp;•&nbsp;
  <a 
     href="https://Instagram.com" 
     onclick="sendSocialClick1209416('Instagram', 'https://streetphotography.blog');" 
     target="_blank" 
     rel="noopener">
    Instagram
  </a>
</p>

send-social-click-to-ga-1209416.js

/**
 * Send a custom event using the newer gtag.js API
 * instead of the older analytics.js API.
 */
function sendSocialClick1209416(soc, link) {
  __gtagTracker("event", "socialshare", {
    event_category: "socialshare",
    event_action: soc,
    event_label: link,
  });
}

/**  
 * Usage: 
 *
 *  - Install the JS code using a insert headers/footers plugin, theme settings, 
 *    or a proper PHP filter hook in your child theme's functions.php file.
 *
 *  - Placement: Place this JS function in the before </head> or, 
 *    before </body> is for slightly better page speed results.
 *
 *  - Call sendSocialClick1209416('Facebook', 'https://www.mycool.site'); instead of 
 *    calling the old ga(); analytics.js function.
 */

send-social-click-to-ga-1209416.php

<?php // Ignore this line if adding below to functions.php.

/* Inline script printed out in the footer */
function add_script_wp_footer_1209416() {
    ?>
        <script>
          function sendSocialClick1209416(soc, link) {
            __gtagTracker("event", "socialshare", {
            event_category: "socialshare",
            event_action: soc,
            event_label: link,
          });
        </script>
    <?php
}
add_action('wp_footer', 'add_script_wp_footer_1209416');

See live demo.

GA real-time report results.