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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.
Only download software from reputable sources
In the same way that you should only shop from reputable online stores, do the same if you need to download software. If not, you may find your system compromised by trojans or backdoor malicious code. If you're not sure, consider using a search engine, typing in the name of the website and 'review.'