Seriously, I am surprised by how out of touch most people on HN are. I'm 23 and everyone I know uses this app, and it's pretty good. One of the main reasons people use it is that you can type in the name of anyone you've ever met and start talking to them instantly. The idea that people are going to stop using Facebook because they no longer support messaging on the mobile web is laughable any place but HN. Any serious FB messaging user knows the app is much better than the mobile web client, which nobody uses.