Seems that Twitter has rescheduled its downtime for tonight because it is used by Iranians to communicate during the crisis. This is Twitter's explaination:
"Down Time Rescheduled: A critical network upgrade must be performed to ensure continued operation of Twitter. In coordination with Twitter, our network host had planned this upgrade for tonight. However, our network partners at NTT America recognize the role Twitter is currently playing as an important communication tool in Iran. Tonight's planned maintenance has been rescheduled to tomorrow between 2-3p PST (1:30a in Iran)."
The full text can be found here.
Wow. Just wow... Thoughts?
Last summer when the hurricanes swept into NOLA and Galveston, I followed several people riding out both of the storms who were using Twitter to stay in touch. This move is much more than that and I have to commend Twitter and it's partner.