Twitter.com: The truth is that the best URL shortener for Twitter is the one that’s built into Twitter. Also, your reporting with Google Universal Analytics will likely have to change, so switching in the middle of your event could distort your data. When you check the box to enable tracking, we'll show the campaign title as it will appear in your Google Analytics account after the campaign is sent.
An auth token is not necessary for expand requests. You can see when you created the link, how many people have clicked on it, and a few more details. As an example of how link tracking works, if your site’s domain is example.com, your link domain might be set to link.example.com. All you have to do is enter your destination URL, and give your tracking link a name.
The process must be fast, not handle clicks which have been deactivated by other processes and ensure links work even if the Analytics event fails. This app quickly sees which of your links are more efficient in driving incoming traffic to your site. The Google Analytics account has to be set up and configured before the tracked campaign is sent.
Build trust & increase click rate: people tend to click on the links that they trust rather than unknown URLs (ie. bit.ly/buSzh might be a spam link). Twitter will use this to make your timeline better. To add affiliate sub IDs, check the Add Sub ID box. See if you are using Classic Analytics (ga.js) or Universal Analytics (analytics.js).