Don't try to do this online

Even good sites may have certain tools that aren't so hot. Some sites may make you poorer. And sometimes the problem is you.

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Shopping online
Don't: Shop online in a coffee bar.

Buying stuff on a public Wi-Fi connection is like reading your credit card number out loud. Any snoop with the right tools can steal your info, says Javelin Research analyst Mark Schwanhausser.

Instead: Wait until you're on your home network. If you must shop on the go, use a mobile connection.



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Last updated February 22 2010: 6:17 PM ET
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