Entrepreneurs awaiting the marketing liberation wrought by the Jumpstart Our Business Startups Act of 2012 -- which was expected to lift a long-standing ban on "general solicitation" advertising -- may have to wait longer before using Twitter and LinkedIn to find investors and clients. Some advisers have cautioned the entrepreneurs from wading in because "securities regulators have yet to iron out rules that would detail, for instance, the kinds of marketing messages ... entrepreneurs can use," Ruth Simon and Angus Loten write.

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