For example, a shopping cart system we've evaluated for our own store's possible use, allows affiliates to get the email addresses of every sale made through their link. Another company owner just told me he was considering online invoicing ASPs to electronically bill his clients, until he realized that every client email address would go through and possibly be harvested by that ASP's parent company's systems.
It's so easy to write "We never share our customers or readers emails with anyone!" in your privacy statement. It's a lot harder to stick to that promise in real life.
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