Assuming you can find an appropriate Twitter feed, users can provide very specific info that you would never hear on the TV or radio because the info is just too specific for a general audience. Instead of a dozen reports in the field, you've got thousands of folks posting their observations in real time, although the signal-to-noise ratio can also be quite high so you have to be careful about what you believe.

Like with yesterday's San Diego blackout, a lot of people needed gas because they were running out due to the gridlock, but many stations were out of power. In my area, the power outages were here and there, so people might Tweet about stations that were still open. (Not that I recommend people read Twitter while they're driving. Duh.)

Come to think of it, can you imagine what commemorating 9/11 would be like if we had old Twitter feeds to dredge up for all these TV specials? Dozens of messages like, "I'm on floor 87. Flames down the hall. I'm trapped!" It's tough enough listening to 911 audio tapes.