StumbleUpon is a famous social media site that can be used to drive traffic towards your website. You can display a custom message to the visitors coming from the StumbleUpon site.
Instructions: Add the following code to the header.php file of your WordPress theme.
Replace the text in third line with your welcome message.
<?php if( strpos($_SERVER[HTTP_REFERER], "stumbleupon.com" ) == true ): ?>
<div class="welcome-stumbleupon">
<p>Hello StumbleUpon user!</p>
</div>
<?php endif; ?>
You may also enjoy using category parent template.
Sweet!
Great snippet Filip, forgot to link your name to the wp site, updated the post.