This week’s headlines: Snapchat Gears Up for IPO, Snapchat Lets Advertisers Buy Ads Based on Nielsen Digital Rankings, Facebook Updating Trending Topics, Facebook Testing Prominent Ads on Messenger, Explore Tab Makes Debut on Twitter and Facebook Updates News Feed Algorithm to Emphasize Long Videos.

The week’s news quick hits: Google Voice Gets First Update in Five Years, Twitter Launches Vine Archive, Tumblr Adds Stickers and Filters, Instagram Live Stories Rolling Out Globally, Facebook Tests Its Version of Stories, Google Purges Fake News Publishers from Advertising Platform, Facebook Updates Privacy Basics Page, Facebook Supports Physical USB Keys for Authentication and Twitter Joins Instagram.