This week’s headlines: Facebook Updates Graph Search and Brings It to Mobile, Twitter Allows Ad Targeting for App Installs, Facebook Rolls Out New Tools for Brands and Publishers and Instagram Reaches 300 Million Users.

The week’s news quick hits: YouTube Warns Users of Copywritten Material, Tumblr Launches Discovery Dashboard, Google Updates Hangouts App, YouTube Offers Contracts for Content, LinkedIn Updates Its Homepage and Vine Adds Double-Tap to Like.