You can also create a tracking domain to “gather metrics for all users that are shortening links to your site”. Publish one custom branded short link on my business card, then keep the destination URL updated so that people are always taken to my latest blog post when they visit.
An auth token is not necessary for expand requests. This is also effective if you simply want to find out how effective your backlinks are. The distributed link tracking service tracks link sources for shell shortcuts and OLE links within NTFS file system volumes.
You can add parameters that help track certain campaigns or store values from an affiliate's tracking system. This is similar to how UTM parameters work on the Web.
On Twitter and some instant-messaging services, there is a limit to the number of characters a message can carry – however, Twitter now shortens links automatically using its own URL shortening service, so there is no need to use a separate URL shortening service just to shorten URLs in a tweet. Example for event tracking using the newer API: Previous Next
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