2. Social gestures

In the social media realm, social gestures appear to be the leading trend of 2012. Launched by Facebook in September , this so-called "frictionless sharing" functionality removes the need to click a button to share media with your friends. Instead, everything you listen to, read or watch is automatically posted to your profile once you approve the relevant app.

If you've seen apps such as Spotify or Social Reader in your Facebook news feed, you're already aware of these features.

The trend makes sense for social networks: With 800 million people already on Facebook, its growth is bound to slow. But if sharing becomes automatic, the volume of content on Facebook will grow at an accelerated pace. There's a big problem, however: Users may be "creeped out" by all this automated sharing of their Web activity and grow suspicious of the apps using it.