Wondering who sent the first Tweet or posted the first pet photo to Instagram? The answers may surprise you (and are definitely cute, when it comes to pets)

Twitter has acquired Trendrr, a data analysis company, to better leverage users' tweets about television to draw in more advertisers.

Yahoo has redesigned its Sports, Movies, Music, TV, omg, Games and Weather sites with a more consistent look and some personalized tools, the company said Tuesday.

The Internet reacted to the news that Microsoft CEO Steve Ballmer plans to retire within 12 months as might have been expected – with a flurry of jeers, opprobrium and the occasional heartfelt farewell.

The current generation of teenagers seems willing to share anything on social media, but cares more about privacy than you think, according to a recent Pew study.

Vine, the video service introduced by Twitter in January, now has 40 million registered users, it said Tuesday.

Twitter has announced a new feature designed to give people a better sense of the context behind the site's characteristically short, 140-character tweets.

Path, the social network designed to better connect people who are already well-acquainted, is opening up its API to 13 outside developers to give its users more ways to share content.

Twitter has announced a new program to analyze some users' activity on the site to give marketers better information about how companies' tweets impact sales in physical stores.

A rising percentage of older adults are using social networking sites like Facebook, Twitter and Google+ too, according to a Pew study.

Twitter has revised its guidelines around abusive behavior following bomb and rape threats made against several prominent female users of the service in the U.K.

Finnish mobile phone giant Nokia is asking British graduates on the Entrepreneur First start-up accelerator programme to improve its career services app, JobLens.

LinkedIn is giving companies the ability to place their marketing content into users' feeds, in a move that expands the site's revenue opportunities.

Psst, want to get 1000 followers on Twitter, quick? It'll cost you: Eleven dollars.

Twitter is working on some new approaches to offer more personalised ads to users, partly based on their online activity outside of the social network.

In yet another mobile acquisition, Yahoo has acquired Qwiki, a New York City company that makes an app for turning photos and videos into short, edited movies.

You don't need a big budget to be successful with social media, according to Walmart's director of social strategy. Here are five steps your business can follow to reap the benefits.

A new data analysis has found that iPad users prefer to use their tablet in landscape mode, and tend to use their device most during the first half of the week, late in the evening.

For a product once described as Twitter with a business model, Yammer is becoming more nuanced, morphing into an important feature set that will cross over among Microsoft applications. Just as important, it continues seeing growth and popularity among businesses, where it can act as a hook that can encourage current Microsoft customers to upgrade and adopt Microsoft cloud services.

A US-based social data intelligence provider claims to have found the dollar value of a Tweet for businesses, offering marketers a sought-after revenue metrics into the social sphere.

Taking a page from Twitter's playbook, Facebook started to roll out the use of hashtags.