Over the last few years we’ve been treated to a number of “Facebook revolutions,” from the Arab Spring to Occupy Wall Street to the squares of Istanbul, Kiev and Hong Kong, all fueled by social media. But once the smoke cleared, most of these revolutions failed to build any sustainable new political order, in part because as so many voices got amplified, consensus-building became impossible.

Question: Does it turn out that social media is better at breaking things than at making things?

Recently, an important voice answered this question with a big “ yes.” That voice was Wael Ghonim, the Egyptian Google employee whose anonymous Facebook page helped to launch the Tahrir Square revolution in early 2011 that toppled President Hosni Mubarak — but then failed to give birth to a true democratic alternative.

In December, Ghonim, who has since moved to Silicon Valley, posted a TED talk about what went wrong. It is worth watching and begins like this: “I once said, ‘If you want to liberate a society, all you need is the Internet.’ I was wrong. I said those words back in 2011, when a Facebook page I anonymously created helped spark the Egyptian revolution. The Arab Spring revealed social media’s greatest potential, but it also exposed its greatest shortcomings. The same tool that united us to topple dictators eventually tore us apart.”

In the early 2000s, Arabs were flocking to the web, Ghonim explained: “Thirsty for knowledge, for opportunities, for connecting with the rest of the people around the globe, we escaped our frustrating political realities and lived a virtual, alternative life.”