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Images immediately appeared on Twitter (see Mexicali earthquake photos), but we're now seeing home videos being uploaded to YouTube, giving a more complete picture of the quake. Yet again, it seems social media has a role to play in our understanding of significant news events.
In California, where most of these videos were shot, early reports suggested a long, rolling quake which sent chandeliers swinging and pools overflowing, but causing little damage.
HuffPo also has a roundup of videos from the quake.