At BoingBoing, there’s a lot of helpful hints, centered on those who use Twitter. Here’s one:
“Help cover the bloggers: change your twitter settings so that your location is TEHRAN and your time zone is GMT +3.30. Security forces are hunting for bloggers using location and timezone searches. If we all become ‘Iranians’ it becomes much harder to find them.”
For all the tips, please read the whole thing.