I am seeing several questions, some of which have been asked as recently as 6 months ago.
Some were closed as non constructive while some aren't.
What exactly is the criteria for this?
closed as not constructive by Josh Caswell, Wesley Murch, Bo Persson, amanaP lanaC A nalP A naM A, Nicol Bolas Jul 25 '12 at 0:47
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. If this question can be reworded to fit the rules in the help center, please edit the question.
The Not Constructive close reason explains why:
What does that mean? It means essentially that the question cannot be answered definitively; that there are many possible answers, all equally valid. That's why shopping questions and Gorilla Vs. Shark questions are Not Constructive.
However, occasionally someone asks a question in these categories that is specific enough to be definitively answerable. Sometimes, these questions get a pass.
In addition, some close-worthy questions are so uninteresting that they never achieve the necessary views to obtain the requisite close votes. Cast a moderator flag on those questions, and a moderator will evaluate them for closure.