Lots of crazy, amazing videos out there. Apparently an airburst or strike on Chelyabinsk, reports of a zinc factory being damaged and over 100 injured. Some on Twitter are saying it would have come from the wrong direction for a companion object of DA14.
As far as air defenses shooting it down, I'm not sure how that would even be possible. Maybe a Russian equivalent of that Air Force 747 with the laser in the nose? But I'm not sure shooting at it just to break it up into more pieces that hit the ground would be advisable.