One little feature of the US IPO market is the notion of a "quiet period" where the firm that is headed for IPO is supposed to not talk to the press. A recent famous episode involving the quiet episode had sprung up in the context of the Google IPO, where the founders gave an interview to Playboy days before the IPO, which is inconsistent with the requirements of the quiet period.
The US notion of the quiet period covers 1-2 months prior to the IPO date. I think that a much longer quiet period would help. For this period, the firm should have a zero incidence of advertising, getting mentioned in press releases, giving press interviews, speaking with journalists, appearing on television, recruiting a PR agency, and having shareholding structures involving media companies.
Update: Jayanth Varma disagrees.