News from Vietnam , Tiananmen Square and Kent State galvanized movements . Cell phone video of death of Mohammad Agha - Soltan , at a protest in Iran , goes viral . ` ` Every revolution has icons and symbols , '' Iranian - born writer says . Amateur videos and photos powerful but without substance , experts say .
Photos from Vietnam , Tiananmen Square and Kent State galvanized movements . Cell phone video of death of Neda Agha-Soltan , at a protest in Iran , goes viral . `` Every revolution needs icons and symbols , '' Iranian-born writer says . Amateur videos and photos powerful but need context , experts say .