When I worked in the cell phone industry one of the metrics that was always talked about was the churn rate.
Here is a decent explanation of it from wikipedia:
In its broadest sense, churn rate is a measure of the number of individuals or items moving into or out of a collection over a specific period […]
How to use social networking to create brand recognition for your business, your product, or yourself.
Written by Colleen Coplick [email] for b5media.
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