Stories by Zach Miners

More than half of Facebook's ad sales came from mobile devices in the fourth quarter, showing continued strength in the site's ability to monetize its service on smaller screens.

Yahoo reported a 6 percent drop in revenue for the fourth quarter as sales of its display and search ads dropped compared to last year.

By 2017, the typical mobile user will share their personalized data stream with 100 applications and services every day, with wearable devices and Internet-connected appliances fueling the use trend, according to Gartner.

The way consumers identify themselves on Twitter can now be used by marketers in their decisions to place ads in individual feeds, under a new expansion of the site's advertising program.

Google has acquired Nest, a company that makes a home thermostat that can be programmed from people's mobile phones, for US$3.2 billion in cash, Google said on Monday.

Criticism hurts -- especially when you're not sure where it's coming from, or why, and have no way to respond to it.

Pinterest, the website known for cooking recipes, sought-after shopping items and photos of who knows what, wants to better understand -- and capitalize on -- the content posted by its users.

Snapchat, reeling from a recent hack that exposed millions of user names and partially redacted phone numbers of its members, will now let users back out of the feature that hackers abused.

Facebook, in a move poised to give a major boost to its position as a mass media platform, will soon start placing video ads into users' feeds.

You might think of Instagram's new private messaging feature as a way to share certain photos with just your best friends. But Instagram -- and the Kardashians -- have other ideas about how the tool could be used to serve up promotional content.

As Twitter rings in the new year, it's got some big ideas for expanding its audience by forging more news partnerships.

Apple is taking a closer look at shoppers in its retail stores, under a new program that will push product-related information to their mobile devices using its iBeacon trackers.

Where did you first learn about Amazon's crazy plan to deliver packages via drone? "60 Minutes"? The New York Times? Increasingly, the answer is likely to be Twitter, Facebook or Yahoo, and that's just how the online giants like it.

Users will soon start to see more ads on Twitter based on Web browsing activity, under a new program partly designed to leverage the site's popularity on mobile devices.

Apple has acquired Topsy, a social media analytics company that analyzes a range of data from Twitter, according to a recent Wall Street Journal report.