Hello. My team and I are launching a new iPhone messaging app, and are having pretty mixed results getting sign ups on our preview landing page[1]. We had extremely poor results with paid Facebook advertising, and slightly better results with BetaList[2]. Any advice from the HN community on improving our conversion rate? Is getting a healthy pre-launch email list really that important, or are we better off expending our efforts elsewhere?<p>[1]: nudjapp.com?ad=h<p>[2]: http://betalist.com/startups/nudjapp