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The double-digit growth of social networks in the U.S. are on track to reach their peak, according to a new report from eMarketer. eMarkter estimates nearly 150 million Internet users will be active on social networks at least monthly this year, bringing the reach of such sites to 63.7 percent of the online population. By 2013, 164.2 million Americans will use social networks, or 67% of internet users.

Renren, China's most popular social network, filed for an initial public offering in the United States on Friday hoping to raise as much as $583 million.

A new report on young people's use of social networking and cyber safety reveals that young people may be more aware and better able to manage online risks than their parents commonly think.

A new study from Forrester proves that the majority of Americans are a bunch of lazy re-tweeters. Ninety-three percent of online consumers in emerging markets of China, India, Mexico and Brazil use social media tools at least once-a-month. U.S. and European consumers are far more likely to use social media as a spectator-like sport, joining it and then just watching it fly by. In the U.S., 68% of social media users are joiners, which means they maintain a profile on a social networking site and visit social networks. Only 73% are spectators, or users who mostly just read blogs, online forums, customer ratings/reviews and tweets, listen to podcasts and watch videos. This number is strikingly similar in Europe (EU-7 countries, to be specific), with 69% of users classified as spectators and 50% as joiners.

The diversity of the biological world is astounding. How do new species arise? In the traditional view, most speciation events occur under special circumstances, when a physical barrier arises and divides a population into groups that can no longer interbreed. The populations diverge genetically and eventually can't interbreed even if the barrier disappears.

In an event flanked with all the electric cars that have recently come to market, and a handful of those that are poised for sale later this year, U.S. Energy Secretary Steven Chu and L.A. Mayor Antonio Villaraigosa flipped the switch May 13 on the 500th electric-vehicle charging station installed by Coulomb Technologies as part of its ChargePoint America network.

EU commissioner for Transport Sim Kallas gestures during his press conference on the white paper on the future transport at the EU Headquarters in Brussels. Europe's transport network will need a 1.5-trillion-euro private sector overhaul to meet the demands of a post-oil, post-emissions world, the European Commission said Monday.

The breakthrough is the first-ever transfer, or teleportation, of a particular complex set of quantum information from one point to another, opening the way for high-speed, high-fidelity transmission of large volumes of information, such as quantum encryption keys, via quantum communications networks.

IN JUST a few thousand years, we humans have created a remarkable civilisation: cities, transport networks, governments, vast economies full of specialised labour and a host of cultural trappings. It all just about works, but it's hardly a model of rational design - instead, people in each generation have done the best they could with what they inherited from their predecessors. As a result, we've ended up trapped in what, in retrospect, look like mistakes. What sensible engineer, for example, would build a sprawling, low-density megalopolis like Los Angeles on purpose? Suppose we could try again. Imagine that Civilisation 1.0 evaporated tomorrow, leaving us with unlimited manpower, a willing populace and - most important - all the knowledge we've accumulated about what works, what doesn't, and how we might avoid the errors we got locked into last time. If you had the chance to build Civilisation 2.0 from scratch, what would you do differently?

Large-scale emergencies, such as bombings and plane crashes, trigger a sharp spike in the number of phone calls and text messages sent by eyewitnesses in the vicinity of the disaster, according to a research study by network scientists at Northeastern University.

Although the dune ecosystem is unusual, fragile and is protected by the "habitats" directive of the network Natura 2000, its conservation is very vulnerable to the proliferation of car parks, nearby buildings and inadequate boardwalks installed for protection or beach access.

A full hour before the formal announcement of Bin-Laden's death, Keith Urbahn posted his speculation on the emergency presidential address. Little did he know that this Tweet would trigger an avalanche of reactions, Retweets and conversations that would beat mainstream media as well as the White House announcement. Keith Urbahn wasn't the first to speculate Bin Laden's death, but he was the one who gained the most trust from the network. Why did this happen?

Applications on modern wireless devices make demands on data rate and connectivity far beyond anything experienced in the past. One way to meet these stringent requirements is to give the device multiple antennas or multiple-input multiple-output (MIMO) technology. The problem of physically accommodating these additional antennas in the latest consumer products is investigated in new research from the University of Bristol.

How important is Twitter in the political revolutions sweeping the Middle East? That was the topic of discussion on stage at the CTIA mobile and wireless convention today in Orlando, Florida and two very different, very strong opinions were voiced. "I don't think anyone in their right mind would say that sending a tweet is the equivalent of activism," said Twitter co-founder Biz Stone, "but it's another tool people can use." Kenneth Roth, executive director of of Human Rights Watch, one of the world's most respected human rights organization, framed things very differently though. He said on stage (above) that mobile technology in general would make it impossible today for something like Nazi Germany to unfold again the way it did historically.

How does mobile ownership vary across the world? The latest data from the International Telecommunications Union (ITU) breaks down the number of people for every SIM card subscription across the different continents. Which continents are the mobile rich and which the mobile poor? The results might surprise you. Take a look at the infographic.

The idea of a "digital divide" -- describing those who can or cannot get on the Internet -- has been around since the 1990s. Although, it used to refer mostly to access, now it often also means the quality and speed of Internet access -- and the skills to make use of the technology.

Macro health news breaks when there is a natural disaster, a scientific breakthrough, or a new twist in a policy debate (see: "ACOs"). I read up on the facts and try to make sense of the latest turn of events, but usually from a comfortable distance. Micro health news breaks when a loved one gets a serious diagnosis. Then I follow the unfolding health care story with intensity and I care more about the outcome.

Tim Berners-Lee, the man attributed to the creation of the internet, gave a speech at an MIT symposium and shared his two decades worth of internet knowledge with the crowd. He spoke about a wide variety of issues, from net neutrality, which he is supportive of, to mobile web access. Berners-Lee's words concerning web access raised a couple of eyebrows, and definitely raised the interest of this writer. "Access to the Web is now a human right" he continues, "It's possible to live without the Web. It's not possible to live without water. But if you've got water, then the difference between somebody who is connected to the Web and is part of the information society, and someone who (is not) is growing bigger and bigger."