http://chronicle.com/img/photos/biz/headcount-45.pngBy Eric Hoover. The 21st-century teenager has come to expect instant gratification when clicking through cyberspace. So Isaiah Walker was surprised when he tried to apply to the University of Michigan at Ann Arbor this month. After completing the Common Application online, Mr. Walker, a senior at Anchor Bay High School, in Michigan, went looking for the university’s supplement, only to find it was not yet live. As of this afternoon, it still wasn’t available, which means Mr. Walker must wait to submit an application to his first-choice college. More...