It doesn’t work for any URL in the world, just WP.com-hosted ones. Upgrade to a premium account for more advanced features.
In fact, just from YouTube’s 11 characters, it can encode the numbers from one to 73,786,976,294,838,206,464 in base64. This is also effective if you simply want to find out how effective your backlinks are. The second condition makes sure that we’re not capturing any relative links that typically looks like href="/some-url-path". It’s a pain, but the outbound link tracking code shown below won’t work without it. (It could be made to work with legacy Analytics, but it’ll eventually stop working so it’s best to upgrade now.) Custom Event Tracking Analytics supports event tracking. You can add parameters that help track certain campaigns or store values from an affiliate's tracking system. This UA code can be found next to your website’s profile in Google Analytics Dashboard.
Short.cm also provides an API for developers and Google Chrome extension for better experience. Personally, I use Hootsuite for all of my Twitter’ing so I don’t have the need to go out and shorten it separately.
As an example, their tracking system could have a macro for ad placement that you use to replace "AFF_SUB", and another macro for traffic source that you use to replace "SOURCE". HootSuite also allows you to view a dashboard that tracks clicks for each shortened link shared in the management system.
Personally, I use Hootsuite for all of my Twitter’ing so I don’t have the need to go out and shorten it separately. It doesn’t work for any URL in the world, just WP.com-hosted ones. WP.me is spam-free, because we are constantly monitoring and removing spam from WP.com. In other words, www is arbitrary and no different than any other subdomain. You need to be signed in to your bit.ly account before you can enter tracking data for the link. Note: Not all website UTM parameters work properly with Google Analytics. Your changes aren’t saved automatically, so make sure to choose "Save" to integrate your event with Google Analytics. If you find someone who says he or she loves social media but doesn’t have a twitter account, then that person just likes social media.