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Apps are now discovered outside of the stores.

If you know where, please let the rest of us know (i.e. if the source has better discoverability than the AppStore).

for android you could best-app-market is pretty good. Also xyo and appolearning look interesting.

Facebook in stream app ads.

OK, I didn't say the source should be searchable with multiple criteria...

...which is the same way they were discovered long before they started being called "apps".