Fluther, a “collective” Q & A site, has raised $600,000 in a round of funding, according to an SEC filing. The company did not respond to our request for comment, but the filing lists angel investor and Epinions founder Naval Ravikant as a director. In contrast to Yahoo (NSDQ: YHOO) Answers and Wiki Answers—which let anybody answer and pose questions—Fluther directs questions to specific members based on how they use the site and the topics they list in their profiles. Traffic has more than doubled over the last year and the site had about 184,000 unique visitors last month, according to Compete figures. The startup lists Twitter co-founder Biz Stone as an advisor.

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Update: The company tells us that in addition to Ravikant, investors include Netscape founder Marc Andreessen, along with Ben Horowitz, the partner in his new VC fund; and angel investors Ron Conway and Dave McClure.