This week’s headlines: Bing Adds Facebook Engagement to Search Results, Twitter Acquires Lucky Sort, Google Launches Google+ Content Recommendation Engine, Google I/O Brings Big Announcements and Yahoo In Talks to Buy Tumblr .

The week’s news quick hits: App.net Opens Free Accounts to Everyone, HTC First to be Discontinued, Twitter Expands Media Partnerships, Pinterest Updates Mobile Apps with Mentions, Reddit Allows Customizable Homepage, Google Glass Gets More Social Apps and Tweets Come to Yahoo Search.