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e difference between quick skimming and scanning on the Web, which lodges in the brain's short-term memory and is quickly lost, and the long-term memories that a more thoughtful kind of slow reading provides. "I share Nicholas Carr's feeling that my brain has been rewired," he says.

"It's indisputable that the Internet has made us smarter.... The range of things you can explore in a day is just fantastic compared to 20 years ago," says David Weinberger, senior researcher at the Berkman Center for Internet and Society at Harvard University in Cambridge, Mass. "There's no question that we feel the Internet has made us better researchers, better thinkers, better writers."

Books "are not the shape of knowledge," he says. "They're a limitation on knowledge." The idea of a single author presenting her ideas "was born of the limitations of paper publishing. It's not necessarily the only way or the best way to think and to write."

Thomas’ infographic shows the current size of major social networks as well as the other well-known online services we use on a daily basis relative to their peers.

Mobile: 5.3 billion mobile devices are used worldwide — that’s 77 percent of the world’s population

AVG surveyed mothers in North America (USA and Canada), the EU5 (UK, France, Germany, Italy and Spain), Australia/New Zealand and Japan, and found that 81 percent of children under the age of two currently have some kind of digital profile or footprint, with images of them posted online. In the US, 92 percent of children have an online presence by the time they are two compared to 73 percent of children in the EU5.