We have recently enforced that questions on this site need to be about claims of a certain notability, mainly to limit our scope and prevent that off-topic questions can be rephrased in the manner "I heard from my friend that ...".
We should establish some guidelines on how notable claims have to be to be on-topic here. Do we want only claims that have achieved wide circulation, or do we answer most claims, but just exclude the very fringe of beliefs.
My impression is that at the moment many users are applying pretty different standards, that we don't have a common perception of what a notable claim is. We should find some general rules, to prevent the notability criterion to become arbitrary.