This Week in Social is a weekly digest of some of the biggest stories in social media marketing news. These stories are the show notes for the Brave Ad World Podcast. Each story is discussed at a deeper level on the podcast.

This week’s headlines: Facebook Updates User Privacy Documentation, Path Adds ‘Inner Circle’ and Private Sharing Features, LinkedIn to Sell $1 Billion in Stock, Twitter Laying Groundwork for IPO, Instagram Acquires Luma, Facebook Gifts Shifts to Gift Cards, Facebook Removes Third-Party App Requirement for Promotions, Twitter Acquires Trendrr and Tech Companies Eying Foursquare for Strategic Investments.

The week’s news quick hits: Facebook Testing Trending Section in News Feed, Facebook Delays Video Ads Launch, LinkedIn Phases Out Company Pages, Viggle Launches Audience Network, Facebook to Pay Users in Sponsored Stories Settlement, Yahoo Notifies Users of Username Wishlist, Feedly Launches Pro Version for All Users, Twitter Simplifies Reporting Abuse, Twitter Updates Conversation Views and Foursquare Launches Proactive Recommendation Feature.