As it ages, Stack Overflow is developing a problem where the accepted answers to questions are obsolete and no longer work. APIs get added and removed, new lan

As it ages, Stack Overflow is developing a problem where the accepted answers to questions are obsolete and no longer work. APIs get added and removed, new languages change syntax, etc. This is particularly the case in mobile. Stack Overflow has no good mechanism for ousting obsolete answers in favor of the current right answer.