Wow, US government asked Twitter not to do maintenance during the Iran election:
State Department to Twitter: Keep Iranian tweets coming
Senior officials say the State Department is working with Twitter and other social networking sites to ensure Iranians are able to continue to communicate to each other and the outside world.
…they do want to make sure the technology is able to play its sorely-needed role in the crisis, which is why the State Department is advising social networking sites to make sure their networks stay up and running for Iranians to use them and helping them stay ahead of anyone who would try to shut them down.
For example, senior officials say the State Department asked Twitter to refrain for going down for periodic scheduled maintenance at this critical time to ensure the site continues to operate. Bureau’s and offices across the State Department, they say, are paying very close attention to Twitter and other sites to get information on the situation in Iran.
[From CNN blog]