If you, like me, have doubted whether Facebook could live up to its valuation, you should read this:
So if you want to reach the 100 people on Facebook who live in California, are between 18 and 36 years old, like “space” and work at Apple or Google, you can. Amazing.
The specificity of targeting ads to users based on their self-revealed interests is staggering. When I read the example in the linked article, all the pieces fit together for me, and I agree with the article — Google should be worried.