Google Analytics is a great tool for discovering what channels send traffic to your website. But simply knowing the channel or the landing page isn’t necessarily good enough.
Link tracking allows you to know what specific posts are driving traffic to your site and to gauge which posts are performing best. This allow you to test Tweets or Facebook posts with different messages or images to determine what combinations are more likely to result in a click.
In order to track these links specifically, you need to tag your URLs in a systematic way. Google’s Campaign URL Builder is a free tool that helps you create these special URLs by entering a few parameters.
Learn about UTM Tracking URLs and the specific parameters needed to make your data more meaningful in this article from RazorSocial.
A bit of advice: create consistency in how you create these URLs. It will be easier when you have hundreds of URLs being tracked and compared.