Bill Keller

Twitter and Facebook are brilliant tools, the journalistic uses of which are still being plumbed. They are great for disseminating interesting material. They are useful for gathering information, including from places that are inaccessible.

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.