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Forget about the hybrid auto -- Shai Agassi says it's electric cars or bust if we want to impact emissions. His company, Better Place, has a radical plan to take entire countries oil-free by 2020.

Rheingold points to five reasons for teaching students social media: Developing students' literacy in our new online environment is as crucial as developing their abilities to read and write. Communication is moving toward social media. We can either help students thrive in this environment or leave them flailing. Many students bring their computers to class. Why not work with this trend instead of fighting or ignoring it? Social media is just that: social. Students who use Twitter for class are "learning collaborative skills that are particularly important today." There is only so much class time. Rheingold makes mini-lectures on video that students comment on between classes, allowing more time to engage the issues through in-class discussion. Shy students who hold back in class often speak up online. "If you can extend the discussion to an online message board, you enable students who may not jump into the discussion," he said, to "make a thoughtful contribution."

“Wave is what email would look like if it were invented today.”

“Kids can get carried away with what they type and things can get out of hand,” Ms. Schwartz said. “That is why, with all of this, it’s more important to teach overall responsibility than to attack individual texts you may encounter if you decide to snoop.”

The implication is that 11% is a small number, but if we look deeper, it turns out that Twitter has a higher concentration of teens than Facebook.