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Social networks can be too social
Popular social networks like Facebook, Twitter and LinkedIn are happy hunting grounds for cyber-criminals. Use common sense when sharing data, even if you think you are in a trusted environment. Do not post anything sensitive or overly revealing because your privacy is never guaranteed. Pay special attention to the security features and try to avoid clicking on strange video or links to news items that can lead to social engineering attacks.
Patch, patch, patch
Hackers rely on security vulnerabilities as entry points into your machine. It's important to stay on top of security patches and enable automatic updates on every piece of software where it's available. Use Windows Automatic Updates to ensure operating system patches are applied in a timely manner. In addition, Use a reputable anti-malware product and make sure it's always fully updated. Don't forget about security patches for third-party software products (Secunia CSI can help with this). When installing software, go slowly and look carefully at pre-checked boxes that may add unwanted crap to your machine. One last thing: Go through your control panel and uninstall software that you don't or won't use.