Shielding Yourself from Prying Eyes and Algorithms on Google, Facebook and Twitter

A quick how-to on shielding yourself from online tracking by Google, Facebook and Twitter, from Mashable:

Many sites, apps and browsers are using your information in ways you might not entirely comply with if you'd take the time to read their privacy policies. Often, opting out is only a click away, though it may be difficult to find out where exactly to click. We've compiled this list of ways various Internet companies are tracking and using your data — plus, given you the tools to opt out, if you wish . . .