I can't speak for JamesBarney's reasons, but agree with them that it's probably minimal.

Facebook and Twitter have better funded research groups focusing just on the sub-task of knowing what my current state is (a necessary part of being able to tell if you've changed my preferences), and for advertising purposes I am categorised as being into nouns I don't recognise, foods and sports which repulse me, and so on.

I expect the three letter agencies to mix me up with the horror film director I share a name with, and also to confuse me with three pet dogs and two pet cats.