As rumored, Google bought Writely.
Marketers' spending on social media has tripled in the past seven years but falls way short of where marketers expected it to be when they peered into their crystal balls in 2009.
Advertisers have been flocking to Snapchat, which now has more daily users than Twitter and is increasingly seen as perhaps the biggest threat to Facebook's dominance in social.
Header bidding is a programmatic technique that allows publishers to offer their inventory through multiple ad exchanges before they serve up ads from their ad server.
YouTube is said to be preparing new non-video features that will allow content creators to interact with their viewers through photos, text posts, links and polls.