Alternatively, if uppercase and lowercase letters are differentiated, then each character can represent a single digit within a number of base 62 (26 + 26 + 10). Because plain-text campaigns don't use hyperlinks to hide MailChimp's tracking information, subscribers who view your plain-text campaigns will see the full tracking URLs. Charts and Graphs Get free real-time graphs so you can clearly visualize your link activity and see where you're getting the most response. See if you are using Classic Analytics (ga.js) or Universal Analytics (analytics.js).