I think the reason these kinds of things aren't done very well for a long time is because of existing implementations. Would-be creators do some research and decide the market is taken, not realizing how much room there is for a great implementation.
Geni, Gmail, Flickr, Facebook, and the new Evite competitors come to mind as examples of people ignoring that affect.
Geni, Gmail, Flickr, Facebook, and the new Evite competitors come to mind as examples of people ignoring that affect.