OK, thanks for clarifying.
I agree that if I don't have a crisp understanding of what it means for X to exist (such that maybe X implemented as a neuronal pattern exists, and maybe it doesn't, and no amount of data about the world could tell me which it is because I don't know how states of the world map to the existence or nonexistence of X in the first place ) then I can't clearly assert whether X exists or not.
For my own part, I'm fairly comfortable refusing to use "exists" to refer to that which abstract objects are doing by virtue of being represented by a particular neuronal pattern, and I'm consequently fairly comfortable identifying as a nominalist (for purposes of this question). If I were instead comfortable using "exists" to refer to that act, I would identify as a Platonist (fpotq). If I was comfortable doing both, or neither, I would choose "Other."
Despite being (IMO) a philosophy blog, many Less Wrongers tend to disparage mainstream philosophy and emphasize the divergence between our beliefs and theirs. But, how different are we really? My intention with this post is to quantify this difference.
The questions I will post as comments to this article are from the 2009 PhilPapers Survey. If you answer "other" on any of the questions, then please reply to that comment in order to elaborate your answer. Later, I'll post another article comparing the answers I obtain from Less Wrongers with those given by the professional philosophers. This should give us some indication about the differences in belief between Less Wrong and mainstream philosophy.
Glossary
analytic-synthetic distinction, A-theory and B-theory, atheism, compatibilism, consequentialism, contextualism, correspondence theory of truth, deontology, egalitarianism, empiricism, Humeanism, libertarianism, mental content externalism, moral realism, moral motivation internalism and externalism, naturalism, nominalism, Newcomb's problem, physicalism, Platonism, rationalism, relativism, scientific realism, trolley problem, theism, virtue ethics
Note
Thanks pragmatist, for attaching short (mostly accurate) descriptions of the philosophical positions under the poll comments.
Post Script
The polls stopped rendering correctly after the migration to LW 2.0, but the raw data can be found in this repo.