If there's one thing I don't like about iOS it's that apps don't seem to have control over decrementing a notification number. i.e. the red number on an icon.
For instance, FaceBook and Twitter. If I get a reply to something, and I check that site on any of my devices, the number will clear there, but will remain on my other devices. Now I have an Air, an iPhone and an iPad. When I get a reply notification it appears on all three devices. With ML even on my Notifications list. But I then have to clear it manually on the other two once I check on one.
Would be really nice if at least the Twitter and FaceBook frameworks (Now that they're integrated in iOS and OS X) could be modified to know when you have checked this stuff, or update themselves to the actual number of notices on the actual websites. And could clear itself when I open the apps or website on another device.
Silly really. Minor inconvenience, but silly oversight. And could easily be a special case handle since Apple could control it directly. Unless apps have no way of emptying their number without opening the app? Apple should just make a way.