By checking the source code of the page you will notice that the hyperlink has rel="nofollow" (something like <a href="siteurl" rel="nofollow">anchor</a>)
no-follow is the link that Google and other search engines won't follow and they won't count as back links You can check that by viewing the source code you will see if it's no-follow or not
The nofollow tag is beneficial for you to use if you're linking to sites that you feel can hurt you, either due to their content, pagerank, etc. OR if it's a link someone paid for such as a sponsor link. Advertisers prefer for you not to use a nofollow tag for their links, but you have to weigh the benefits of pleasing all your advertisers or possibly hurting your SERPs.