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A shadowy terrorist group called Assistants of the Global Jihad claimed responsibility for the bombing of the Norwegian Prime Minister's office and a massacre at a children's day camp via the Internet. A terrorists group has claimed responsibility for today's attacks in Oslo, Norway--which included the bombing of the Prime Minister's office and a massacre at a children's day camp by a gunman dressed as a police officer--using social media.

Eric Schmidt maintains Google Plus isn't in competition with other social networks; LinkedIn's Jeff Weiner isn't convinced the two can coexist. Who's right? Google Plus's overnight success has sent the tech press and Google 's competitors into a frenzy over how much market share the new social network will grab

Twitter might boast more than 200 million users, with over 70% tweeting from outside the U.S., but Sina Weibo is fast catching up, with 140 million users and 10 million new accounts added each month. The latter service, often referred to as the "Twitter of China" (much like the Facebook copycats ) is considered by many to be a knockoff of the microblogging platform. Yet while there are many similarities between Twitter and Sina Weibo, the services are actually being used in very different ways,

You've grown to 140 million tweets per day and impacted global politics.

Social travel advisor Gtrot is banking on your friends to make its business model work: The newly launched travel-recommendation system leverages the wealth of travel and venue advice available from your extended social graph. Gtrot's system is pretty simple: It looks at the information available from your social network on Facebook and Twitter , determining information about where your contacts have traveled, where they've stayed, or if they live near where you're going. Instead of relying on "Bob, age 48" on TripAdvisor, who may have hated the hotel you're considering, you can solicit a more personal, trusted opinion from someone you already know pretty well

According to one set of analytics, the Google+ social network has resulted in such rapid adoption of a "+1" button on websites that it's outclassed sharing stalwart Twitter already. Here's why that matters--only a little

Mark Zuckerberg most popular on Google+, small businesses still struggling, Amazon launches pet store, and more. Mark Zuckerberg dominates Google+.

Google+ takes its profiles public (or else), another tweet feed hacked, EU digital frontier is irrelevant? This and more important news from your Fast Company editors, with updates all day

Ever wonder what is really motivating you to hit "retweet," "like," or "share"?

Email is an unavoidable burden for most, and an undeniable time-suck for all. But now, social startup 410 Labs is trying to fix our email woes with Shortmail.com, a service the Baltimore-based company considers the Twitter of email

There was a point over the winter where every germ in New York City seemed to find its way to my doorstep and I was alternating between playing nurse and patient for from mid-February to the end of March. No problem. One of the perks of being an entrepreneur is that you’re the boss.

What do hundreds of dollars worth of parking tickets, people cued up on Southern California streets, and Vietnamese Banh Mi sandwiches all have in common?

According to numbers dug up by Mashable , microblogging newcomer Tumblr has just surpassed the 20.7 million blogs hosted by WordPress--explosive growth since it only hosted around 7 million blogs as recently as January. Exponential growth like this means it's probably just the beginning of many record-breaking events

Kevin Systrom launched popular photo-sharing app Instagram in October--and already it boasts around 5 million users. By comparison, it took years for startups such as Facebook and Twitter to reach that growth

Can TV's Ashton Kutcher, Improv Everywhere's Charlie Todd, tech giant Intel, and random people on the street find the gooey center of viral hilarity? At the very least, we'll laugh and learn while their IdeaJam project publicly fails