Wael Ghonim, the charismatic young Google executive who helped launch the protests in Tahrir Square, sounded the trumpet in a first Twitter message Thursday afternoon: "Mission accomplished. Thanks to all the brave young Egyptians." But he soon sent another message urging protesters to wait for official news - and when President Hosni Mubarak finally made his speech late Thursday, it shattered protesters' hopes for a quick transition. The confusing denouement, coming after hours of predictions...