This week’s headlines: Snapchat Debuts its First Ad, Foursquare Unveils First Ad Campaign, Tumblr Ad Performance Revealed in Yahoo Earnings Report, Twitter Pitches Fabric to Developers and Facebook Launches New App Called Rooms.

The week’s news quick hits: Flickr Launches Its First iPad App, Twitter Plans 2015 Rollout for Buy Button, Foursquare Launches Video Ad to Promote Messenger, Tsu Promises to Share Revenue with Content Creators, Groupon Unveils Pages, Google Launches Inbox and Ello Becomes a Public Benefit Corporation.