A few problems with this LW survey:
Most of the interesting options in the original PhilPapers Survey are collapsed into 'Other'. This makes it needlessly tempting to side with one of the named positions in order to make one's answer usefully contentful. It also makes our comparisons to the original poll much cruder. The original survey provided (regularly used) options for: 'accept all', 'reject all', 'accept an intermediate view', 'accept an alternative', 'the question is too unclear to answer', 'there is no fact of the matter', 'insufficiently familiar with the issue', and 'agnostic/undecided'.
The current format discourages changing your mind (e.g., it exacerbates consistency bias) because it disallows changing your old votes. A lot of these issues are difficult and require research and re-evaluation; rather than encouraging thoughtful and dynamic reasoning of this sort, our version of the poll seems to primarily encourage rushed and static (and often sloppily dismissive) judgments.
Some of the original explanations of the options are a bit too incomplete or misleading. I'm not attacking the idea of adding explanations -- we aren't professional philosophers, and in any case our deeper goal should be to encourage more research into the more interesting of these topics, not just to acquire a static snapshot of our ideological commitments. But we should be more systematic about providing adequate explanations for every question, and we should rely mostly or entirely on quotations from authorities defining the relevant terms, so as to put as minimal a spin on the questions as possible.
The specific questions seem to be based on an older, inferior version of the survey. "Language: Russelleanism or Fregeanism?" should be "Proper Names: Millian or Fregean?". Libertarian incompatibilism should be distinguished from the view that we simply don't have free will. The "personal identity" question should clarify "biological view" in lieu of "physical view", and add the "further-fact view" option. And the newer version also has "communitarianism" as an option alongside liberal egalitarianism and libertarianism (which is significant because, e.g., most Continental philosophers who answered the poll favored communitarianism). All of these changes are present in the main PhilPapers Survey.
In the interests of beginning to resolve all 4 issues, I've put together a hub of resources here, in a Google Doc for clarifying the meanings of the 30 questions. You can add questions, suggestions for changes and additions, and votes as Comments, and if there's enough interest I'll make another Doc (or something more structured) for hosting a revisable database of votes on these issues.
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.