I think it's a bit of a leap to attribute the Arab Spring to Facebook's contribution. It was long overdue and it would have happened with or without facebook.
Would we blame it on facebook if the spring failed to lead into summer? If not then it stands to reason that we can't credit facebook with the success either.
The Arab Spring and all the good that may come out of it belongs to the Arabs, to those that laid their life on the line and to those that stood up to oppression.
Connecting humanity is an important thing but we have a very large number of ways to do that, facebook is but one of those.
I'm with you that connecting peoples lives in such a way is beneficial, but I'm not quite sure yet if Facebooks net value is positive or not if you factor in the massive privacy violations that have already happened coupled with those that are surely to come.
No social network has the potential for good as much as facebook does at the moment. But at the same time that potential needs to be realized and that needs to be balanced with a healthy respect for the privacy of the users of that network.
For a good read on the Arab Spring and the online movements:
http://www.theatlantic.com/technology/archive/2011/09/so-was...
The telephone, the internet in general, twitter, online news media and yes, Facebook all played a minor role. But in the end it was the people that made the change and they would have found a way to communicate. Possibly not as effective but there have been revolutions all over the world that pre-date the invention of the telephone so a new piece of technology is likely not an enabler but simply one more line of possible communication.