Is Facebook Ads worth it?

What is your experience with Facebook ads? Does it help to increase the # of downloads?

I have tried Facebook previously but the result was not very satisfactory.
Here was my settings:

  • tiny daily budget (~$10).
  • targeted audience: narrowed down to about 100, 000 people
  • optimized for impressions (maybe this was what I did wrong?)

Was your Facebook ads a success?