The first version of a great idea is usually awkward. It might sound too niche, too unserious, or too obvious. That is exactly why it gets overlooked.
Weedeas can turn that dynamic into a feature. Let people post raw concepts. Let the audience decide which ones are nonsense, which ones are genius, and which ones somehow manage to be both.
The signal appears when patterns repeat. If strangers keep reacting to the same type of post, there is probably something there.