Quoted:
Yes, Facebook thinks it knows how liberal or conservative you are. Did you know you can see that info for yourself? Tell us how you did!
Go to facebook.com/ads/preferences on your browser. (You may have to log in to Facebook first.) That will bring you to a page featuring your ad preferences. Under the “Interests” header, click the “Lifestyle and Culture” tab. Then look for a box titled “US Politics.” In parentheses, it will describe how Facebook has categorized you, such as liberal, moderate or conservative. (If the “US Politics” box does not show up, click the “See more” button under the grid of boxes.)
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Some of that is gold.
In politics, it says I am "Conservative". I suppose generally speaking I would be categorized as Conservative, although I identify as more "libertarian".
But under Hobbies and Activities, it lists an interest as "Cement". Yep, Cement. WTF?