As seen in the link above, I'm referring to Amnesty International's main account: @amnesty. It's where the organization posts its priority issues. And @amnesty has written 0 on the Iran protests. All they did was retweet a post on Iran from their MENA account—dated September 16.
Let me be clear: I know there are many people connected to Amnesty International who care passionately for the heroic protesters in Iran, and who are doing amazing work. But if Amnesty's primary Twitter account is an indication, it seems that the leadership is burying the story.