Comrades, we need a thread on privacy. Any decent activist should try ways of staying anonymous on the web and prevent being tracked by governments and corporations.
General tips ===
* Use free software as much as you can.
* Use GNU/Linux and keep it up-to-date, to be sure that you don't have unpatched security exploits
* Don't use Flash Player, use youtube-dl instead for watching streaming videos online
* Do not use Google, use DuckDuckGo or StartPage instead
* Use a password manager like Keepass or for GNU/Linux users keepassx. Create new passwords for every site that you visit and use a strong password as a master password. A tip for easy remembering of your master password is to use a sentence. "i fucking love cookies and tits!" with extra capital characters etc. is easier to remember than some random characters and long enough to prevent brute force attacks of any kind.
* Use the Tor Browser Bundle if you really want to stay anonymous.