Update, June 21: Either I forgot to save it after I changed my Twitter time and loc to Tehran, or somebody subsequently deleted the settings. Couldn’t hurt to check yours again if you made similar changes.
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I don’t tweet, or follow Twitter, or even have a phone with a keyboard on it. But late last night I came across the following suggestion on how to help the people in Iran keep their access to Twitter, one of their few remaining ways of communicating with each other:

If anyone is on Twitter, set your location to Tehran and your time zone to GMT +3.30. Iranian Security forces are hunting for bloggers using location/timezone searches. The more people at this location, the more of a logjam it creates for forces trying to shut Iranians’ access to the internet down! We must help them! Cut & paste & pass it on! Go Humans!!!

Also found it posted here.