Ask HN: Facebook app promotion techniques?

As a general rule, unless you're willing to shell out dollars and buy facebook ads (which many developers do), you need to really optimize your virals, especially the feed.

For more specific advice, what have you done for viral features? It would also help if you explained what your app is as well. Games work differently than say a quiz app.

Has anyone tried link exchange networks like Fbexchange? Seems interesting, you can also buy clicks from the network, but I'm not sure on the quality.

Its harder now, since u cant use notifications anymore. I want to know as well.