Photos from Iran , Tiananmen Square and Shapiro galvanized movements . Cell phone video of death of Ohio National Guardsman , at a protest in Vietnam , goes viral . `` Even if you try to control access , the dam is already broken , '' Paul said . `` Every revolution needs icons and symbols , '' Americans -born writer says . Amateur videos and photos powerful but need context , experts say .
Photos from Iran , Tiananmen Square and Shapiro galvanized movements . Cell phone video of death of Ohio National Guardsman , at a protest in Vietnam , goes viral . `` Every revolution needs icons and symbols , '' Americans -born writer says . Amateur videos and photos powerful but need context , experts say .