Experts Exchange, basically if stackoverflow was quora. Can only see questions even when logged in and you’d have to pay a pretty penny to get access to any answer. Or you could collect enough points to access the answer you need by writing answers yourself (ridiculously many points, think weeks of answering).
Making matters worse is that half the statistics that would show the abysmal rate count “thermally recycled” (=burning it) towards the same metric and are thus pretty meaningless.