Facebook’s Biased Targeting

You may think you are discreet about your political views. But Facebook, the world’s largest social media network, has come up with its own determination of your political leanings, based on your activity on the site.

And now, it is easy to find out how Facebook has categorized you — as very liberal or very conservative, or somewhere in between.

Try this (it works best on your desktop computer):

Go to facebook.com/ads/preferences on your browser. (You may have to log in to Facebook first.)

That will bring you to a...