Twitter vs Facebook: which is more effective for mobilising people to act?

Recent events has had me pondering if Twitter is not far superior to Facebook when it comes to mobilising people to actually take action and do something in the real world.

It was fascinating to hear Suw Charman-Anderson attribute much of the success of the Ada Lovelace campaign she ran earlier this year (I wrote about it here) to Twitter during this Media140 panel back in May. In contrast, many people joined the Facebook group she set up, but few seemed to do something actively after they joined. This sentiment was echoed by her husband Kevin, who found Twitter ever so much more useful than Facebook during his US roadtrip on behalf of The Guardian (I interviewed him about it here, in Norwegian).

Now, in both these cases we are talking about a fairly tech-savy audience, but clearly Facebook's where the major mainstream audience is - surely, that's a lot more useful from a marketing point-of-view, right? The experiences using social media to promote Wandsworth Common Beer Festival, presented in this interesting slide show found via Knut Albert, had me think perhaps not:

I must admit that I personally much prefer Twitter to Facebook, and I have a much more passive relationship to the groups I join or fan pages I sign up to on Facebook than information shared on Twitter. Often, the groups I join are just for fun or a symbolic show of support more than anything I think I'll ever do much with. My Twitter network is so much more relevant to my work and professional interests than Facebook, which is more of a mixed bag. Also, Facebook is more personal - a way to keep up with people not on Twitter, or people or projects I've "known" for quite some time" (mostly in real life). But I feel myself going over well known territory saying that, we all now Facebook and Twitter are different, that's not really my point, but I'm curious to learn/ see more of how effective the two sites are for moblising people to act - surely, that is a marketeers ultimate object, right?

Am I all wrong in thinking Twittter might be superior to Facebook here, and if so: in which cases are Facebook the better site to entice people to take action?

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