[conejo99]

It's pretty late to reply, but if you're still interested I'd say:
1) The individuals why know how to communicate in English over tweeter are not representative of any large group (except what is probably a minority of university students and recent graduates),
2) The leaders using tweeter probably want to communicate with their fellow Iranians more than they do to us. If they get a message to the BBC, then the BBC’s Farsi language broadcasters may get their message to the target audience (which is why the government is blaming the English more than us),
3) Some general statement of support for democracy is a good idea. It may actually hurt the dissenters in Iran by giving the government something external to blame, but since it is what we believe it is something we must say.

[DJ MacWoW]

On number 3 I would say that a free country that doesn’t speak out about a nation murdering it’s own in the street isn’t much of a country. Government violence against it’s own citizens always need to be condemned.