As someone whose discipline is history, I have naturally wondered about how the history of the past year will be written. At first glance the vast library of YouTube videos, live tweets as events transpired, cell-phone photos of events from hundred of sources, etc. would seem to mean the revolutions would have been well documented.
But endurance of these media may be an issue. Here's an important article I think: "Losing My Revolution: A year after the Egyptian Revolution, 10% of the social media documentation is gone." Using several aggregation sites, Storify, etc., a test study showed that up to 10% of the content, especially photos and videos, is no longer available. And that's after only a year.
This raises some interesting questions for digital archivists. I commended it to historians, techie geeks of various stripes, and anyone with an interest in social media.