It's becoming clear that the world is listening, so now we're trying to get new groups of people talking.

On Twitter, if you want to quote someone else, you say, RT, re-tweet, that person's name, and then what they said before. And it's a way of essentially saying, I'm not saying this, but my friend said this and I thought this was interesting.

[According to Twitter] 24 percent of American Twitter users are African-American. That's about twice as high as African-Americans are represented in the population.

The wider world is a click away, but whether we mean to or not, we're usually filtering it out.

The Internet has not become the great leveller that it was once thought it could be.

Moments of crisis, like the shooting in Newtown, tend to produce brief spikes of popular interest in gun control. My research on media attention suggests these spikes are extremely short-lived, and that they may be decreasing in intensity.

There's no locality on the web - every market is a global market.