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Shop only at reputable websites
If a clothing or gadget sale online looks too good to be true, it probably is. If you see a padlock next to your browser address, then a secure SSL encryption is in place, and so any financial details input will at least be encrypted. However, if you see none, steer clear. Fake websites, counterfeit boutiques -- any website which doesn't originate from a reputable source could place your bank account or identity at risk.
Keep data divulging on social networks to a minimum
As my colleague Zack Whittaker discovered, sending out a single innocuous tweet containing sensitive information can lead to an avalanche of data which can be discovered and taken from you.
To avoid giving hackers a digital trail, keep the sharing of personal information to a minimum on social networks, and make sure your privacy settings are set as highly as possible. From checking in to a bank and posting it on FourSquare to using GSP technology for sharing your home city or address, a single fact about you can lead to identity theft.
When asked for security questions, consider using fake details, so even if facts about you are discovered they will not line up with the questions asked to access accounts.
Secure your wireless network
Just because your wireless network is at home doesn't mean it is secure. Make sure you enable WPA encryption to prevent infiltrators from poaching your bandwidth or monitoring your network without consent -- which can lead to a detailed profile of your website visits.