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Unique passwords and frequent changes
When some of the most common and popular passwords currently in use include "password1," "qwerty" and "ninja," you know that there are basic security problems out there which are easily fixed.
Use a combination of letters and numbers, and make sure you use unique passwords for different services online -- so if one account is compromised, you may be able to prevent unauthorized access to the rest.
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.