I think people are taking the lean startup method of throwing a landing page up to gain intrest a little too far, this feels quite deceiving and to be honest has annoyed me that oh.. I'm just signing up to a mailing list and have to actually invite my friends to be 'front of the line'.. makes me feel like nothing has actually being built at all apart from a pretty landing page.
Yeah, and using the lean startup method on a HN post like this is particularly deceiving (considering HN is usually for stuff that's been built).