Thats a great list of Internet pioneers. A few days ago, someone on HN suggested these companies put their concerns front and center on the web sites they control. If you want the masses to hear about this, no better way than to replace Yahoo and Google for a day with a clear message telling users what's happening in their country. If these letter co-signees are not willing to take the heat of their own shareholders by making such a move, then writing letters is mostly a waste of time.