This question describes a simple popularity rating algorithm, then asks:
do you see any major flaws with this approach?
The description is very well written, and the question definitely shows research effort. But it seems to me that it may fit into the descriptions of off-topic ("belongs to Programmers" [?]), or maybe not constructive ("will likely solicit opinion, debate, arguments, polling, or extended discussion").
I believe it's a good question, and along with its answers it's a nice read. It's far more interesting than the avalanche of "jQuery to execute PHP MySQL query" I see every day. But should it be on Stack Overflow according to "the rules"? I really hope so.
I'm not asking because the question is endangered (there are no close votes currently), but because I want to have a better understanding of the close reasons. As Yannis Rizos commented, this question sits in a grey area. I have a positive opinion on the question, I'm not voting to close it, but I'd like to know what others would do, and why.