Tehran tricks on Twitter

Someone put this into one of my comments, anyone know if this is true?:

If anyone is on twitter, set your location to Tehran and your time zone to GMT +3.30. 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. Cut & paste & pass it on.

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