Some new research throws into question things we say all the time about the Internet. The research focuses on Twitter, the service that lets many millions of people send short messages to each other from computers or cell phones. It's commonly said that social networking like this is revolutionary, that it's created new communities, even that it's obliterated geography. You can connect with people who share common interests, not just people who happen to live nearby. NPR's Shankar Vedantam is here to explode all that. Hi, Shankar.
Syrian troops have fired rockets and mortars at neighborhoods in the city of Homs that have most fiercely resisted the government throughout the uprising.
Mainstream journalists are barred from entering Homs, so a team of activists decided to record the offensive themselves. The activists positioned their cameras atop buildings in the city. Each morning the view is blue sky, a minaret, a sea of rooftops. Then come the booms.
Twitter announced, last night, that it now has the ability to block content by country. This means, for example, that if a Tweet breaks a German law, Twitter can now block it in Germany but leave it up in the rest of the world.