Another dimension not directly addressed is whether or not the question at hand is technical and/or has a very specific correct solution or response.
A failure I've noted over the past 20 years or so of various collaborative filtering systems, where some function of votes on what is "better" are used, is that many of them degrade essentially to a popularity contest. This can be good if you're trying to optimise for "what will sell the most", but doesn't end up so well if you're looking for "what's the most correct" or "what has the greatest truth value" from among options.
It's commonly noted as the hivemind effect, in a negative sense, particularly where the hivemind (or the effectively expressed result of it) tends to quash correct-but-unpopular views.
A failure I've noted over the past 20 years or so of various collaborative filtering systems, where some function of votes on what is "better" are used, is that many of them degrade essentially to a popularity contest. This can be good if you're trying to optimise for "what will sell the most", but doesn't end up so well if you're looking for "what's the most correct" or "what has the greatest truth value" from among options.
It's commonly noted as the hivemind effect, in a negative sense, particularly where the hivemind (or the effectively expressed result of it) tends to quash correct-but-unpopular views.