Facebook's so-called frictionless sharing means that the apps you use auto-report your activity to your friends' news feeds. Which means you can have inadvertently embarrassing activities showing up without even knowing it. How wonderful!
Apps like Rdio and Spotify are constantly tattling on our sometimes shameful musical choices. But the really embarrassing stuff is often reserved for what we read, in that it can suggest things about us that may not be true. The canonical example is seeing one of your friends suddenly reading lots of stories about cancer. Frictionless sharing is exactly the kind of thing that might cause friction between you and your friends. (Here's how to regain a little of your privacy and dignity.)