Facebook used to solve this (at least for college students) with class listings. That was a really killer feature for a large part of their user base that got a

Facebook used to solve this (at least for college students) with class listings. That was a really killer feature for a large part of their user base that got axed when they launched the app platform and expected an app to take its place. Problem is, of course, 50 apps took its place and none of them won.