Ethan Zuckerberg at Northeastern on Wednesday.

Ethan Zuckerman at Northeastern on Wednesday

The promise of the Internet was that it would break down social, cultural and national barriers, bringing people of diverse backgrounds together in ways that were never before possible. The reality is that online communities have reinforced those barriers.

That was the message of a talk Wednesday evening by Ethan Zuckerman, director of the MIT Center for Civic Media. Zuckerman, who spoke at Northeastern, is the author of the 2013 book “Rewire: Digital Cosmopolitans in the Age of Connection.” He is also the co-founder of Global Voices Online, a project begun at Harvard Law School’s Berkman Center for Internet and Society that tracks citizen media around the world.

I’ve seen Ethan talk on several occasions, and I always learn something new from him. Here is some live-tweeting I did on Wednesday.

https://twitter.com/dankennedy_nu/status/519966015254712320

https://twitter.com/dankennedy_nu/status/519968349418455040

https://twitter.com/dankennedy_nu/status/519969002249277440

https://twitter.com/dankennedy_nu/status/519970428459421696

https://twitter.com/dankennedy_nu/status/519970765496934401

https://twitter.com/dankennedy_nu/status/519972247323553793

https://twitter.com/dankennedy_nu/status/519973089506238464

https://twitter.com/dankennedy_nu/status/519974299156086784

One of the most interesting graphics Zuckerman showed was a map of San Francisco based on GPS-tracked cab drivers. Unlike a street map, which shows infrastructure, the taxi map showed flow — where people are actually traveling. Among other things, we could see that the African-American neighborhood of Hunters Point didn’t even appear on the flow map, suggesting that cab drivers do not travel in or out of that neighborhood (reinforcing the oft-stated complaint by African-Americans that cab drivers discriminate against them).

Since we can all be tracked via the GPS in our smartphones, flow maps such as the one Zuckerman demonstrated raise serious privacy implications as well.

https://twitter.com/dankennedy_nu/status/519974299156086784

https://twitter.com/dankennedy_nu/status/519975183260860416

We may actually be less cosmopolitan than we were 100 years ago.

https://twitter.com/dankennedy_nu/status/519977254718550016

Facebook founder Mark Zuckerberg likes to show a map suggesting that Facebook fosters interconnectedness around the world. In fact, upon closer examination the map mainly shows interconnectedness within a country. The United Arab Emirates demonstrates the highest level of international interconnectedness, but that’s because the UAE has an extraordinary number of guest workers who use the Internet to stay in touch with people back home. That leads Ethan Zuckerman to argue that maps often tell us what their designers want us to believe.

https://twitter.com/dankennedy_nu/status/519978709953294336

This final tweet seems out of context, but I’m including it because I like what Zuckerman said. It explains perfectly why I prefer Twitter to Facebook, even though I’m a heavy user of both. And it explains why many of us, including Zuckerman, rely on Twitter to bring us much of our news and information.

https://twitter.com/dankennedy_nu/status/519979810597400576