The speaker raises some good points. As actively someone protests on the Internet about their country, there are counter forces acting against them. Plus the distractions that Internet holds can be counteracting to the gain that the vast sum of information available.
But I think his argument holds less sway in countries that are 1st world and can afford Internet counter intelligence. Countries like Libya, Syria and Egypt (to a lesser extent) don't have the infrastructure or maybe the resources to devote an entire team of people to gather, sort, and quell online critics in their own country.
For me, the Internet is both democracy's biggest hinderence and its biggest asset. And the more entrenched and wealthy the country's government is, democracy/revolution becomes more difficult to spread.