The best stories across the web on media and technology, curated by Leandro Oliva.

1. In social media and opinion pages, Newtown sparks calls for gun reform (Pew)

2. The New York Times paywall is working better than anyone had guessed (Bloomberg)

3. Facebook set to change your timeline again (Mashable)

4. Instagram reverts to old privacy policy wording after uproar (LA Times)

5. How The New York Times’ ‘Snow Fall’ project unifies text, multimedia (Poynter)