Secure Virtual Private Network Connection Setup. How Do I Torrent Safely Now That Demonoid Is Down? Newsgroups/Usenet... tons of VIRUSES.
Even for Macs. It's like swimming in raw sewage, with a scrapped knee. You go on Usenet, hackers get your machine. It's that simple. OpenDNS - Cloud Internet Security and DNS. Priv3 Selectively Stops Third-Party Sites from Sending Your Info to Facebook, Google, Twitter, and More. Facebook Is Tracking Your Every Move on the Web; Here's How to Stop It. Everyone's Trying to Track What You Do on the Web: Here's How to Stop Them. Your Privacy Kind of Sucks, Fix it Up This Weekend. Since it's hard to trust what companies that get your data will do with it, the best way to maintain your privacy online is to minimize what you give them.
Create accounts with pseudonyms or variants of your name (yes, even Facebook and Google+). Supply only profile information that is absolutely necessary, and lie about critical stuff like birthdates. Turn off all app- and ad-related functionality on Facebook and other sites wherever possible. Aggressively manage all forms of cookies and other persistent storage.