Getting no love on HN does not mean you or the product is not good. Being sad and pouty about it might. Move on, make it so big and good that someone else posts it on HN the next time instead of you doing it.
I'm in the process of growing it, and its users find it extremely useful so far, after they get past the "why can't I just email them?" stage and see that this is much faster.
If anything, Facebook's move provides me with a clear way to position the product, rather than have to say "it's a bit easier than email".
Also I will give it a shot and suggest if there is something that can be improved (at least from an experience perspective). You can of course take it or ignore it too.