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But as the number of friends begins to increase—particularly over that magic Dunbar number of 150—the spell begins to wear off. At this scale, we simply can’t easily keep track of it all. When our number of connections rises above 150 everything becomes simply comments, as real conversations tax our already limited ability to interface with the network.

That mythical thing, social connection, doesn’t flow over these networks; information flows over these networks. The only reason the network ever felt meaningful was because, at small scale, the network operated like a community. But that breaks apart at large scale.

The thing about all these is that they’re not a shared experience—they are my experiences, which I am sharing with you, but you probably cannot experience with me—my thoughts or fascination with the article I just posted, the feeling of getting on that plane, or the thrill of watching the Sharks tie the game. Perhaps you can compare your notes of your own experience of these things; that’s what most Twitter conversation seems to be, to me, but the experiences are not shared. This differs from a discussion in a community, such as the type that occurs on SB Nation game day threads. The conversation does not center around any one individual’s experience, but rather the collective condition of the community. The conversation is the experience. Each comment is driven with the purpose of evoking and expressing the emotions that the community experiences, and particularly the ones they hold in common.

there is no good way to quantify those achievements — putting them in a tough spot with voters deciding whether to bankroll this approach again

“We’ve jumped on bandwagons for different eras without knowing fully what we’re doing. This might just be the new bandwagon,” he said. “I hope not.”

$46.3 million for laptops, classroom projectors, networking gear and other technology for teachers and administrators.

If we know something works

it is hard to separate the effect of the laptops from the effect of the teacher training

The high-level analyses that sum up these various studies, not surprisingly, give researchers pause about whether big investments in technology make sense.

Good teachers, he said, can make good use of computers, while bad teachers won’t, and they and their students could wind up becoming distracted by the technology.

“Test scores are the same, but look at all the other things students are doing: learning to use the Internet to research, learning to organize their work, learning to use professional writing tools, learning to collaborate with others.”

“It’s not the stuff that counts — it’s what you do with it that matters.”

“There is a connection between the physical hand on the paper and the words on the page,” she said. “It’s intimate.”

“They’re inundated with 24/7 media, so they expect it,”

The 30 students in the classroom held wireless clickers into which they punched their answers. Seconds later, a pie chart appeared on the screen: 23 percent answered “True,” 70 percent “False,” and 6 percent didn’t know.

term” that can slide past critical analysis.

engagement is a “fluffy

rofessor Cuban at Stanford argues that keeping children engaged requires an environment of constant novelty, which cannot be sustained.

that computers can distract and not instruct.

guide on the side.

Professor Cuban at Stanford

But she loves the fact that her two children, a fourth-grader and first-grader, are learning technology, including PowerPoint

creating an impetus to rethink education entirely

Mr. Share bases his buying decisions on two main factors: what his teachers tell him they need, and his experience. For instance, he said he resisted getting the interactive whiteboards sold as Smart Boards until, one day in 2008, he saw a teacher trying to mimic the product with a jury-rigged projector setup. “It was an ‘Aha!’ moment,” he said, leading him to buy Smart Boards, made by a company called Smart Technologies.

This is big business.

“Do we really need technology to learn?” she said. “It’s a very valid time to ask the question, right before this goes on the ballot.”