As Craigslist has learned, this kind of transactions may bring all sorts of legal questions for the startup. After all, goods and services without an "official" market are likely to include sex and drugs.
Read MoreFormer VP of Entrepreneurship for the Kauffman Foundation, Bo Fishback, has certainly seen a lot of startups labeled "the next big thing," but perhaps none of them were predicted to be as huge as Zaarly.
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