Maybe this depends on if real life is defined by quantity or quality.
Quoting comment section of that article:
"This article proves Twitter is real life. The main people that use it are the politicians, journalists, academics and educated people. To me that fits the 80/20 rule. That's the 20 percent of the population that influences and controls this world."
Is TV real life? Are movies? How about online news sites, are those real life? Especially back when a few monopolies and 3 or 4 channels dominated the discourse, this one-way flow composed of even fewer voices still greatly influenced "real life".
Reminds me of "hyper-reality" defined by Baudrillard. Most people's references points for understanding significant portions of their world-view come from constructed realities of media, not first hand experience anyways. So impassioned debate from extremely-online minority may actually impact the real world in various ways. I know different political issues that only seemed to exist on Twitter 10 years ago made their way into most other nooks and crannies of the real world a few years later.