It's from Techcrunch not FB. They use retargeting/remarketing ads and sell this info back to Facebook. A lot of websites do that... It's actually easy to find o

It's from Techcrunch not FB. They use retargeting/remarketing ads and sell this info back to Facebook. A lot of websites do that... It's actually easy to find out what people browse on the web only by looking at their FB news feed. If you see a birth control ad on your girlfriend's FB news feed - run away!