Testing your idea thanks to Facebook Ads might be great but I believe there is a better way. In my opinion idea extraction can be done completely for free and you can even get much better results from your research. Here it is what you need to do:

1. You to need to find a way to reach to your niche: through social media (think Facebook, LinkedIn groups, Twitter, etc.) and forums.
2. You connect with individuals directly and ask them about their biggest challenges and issues related to the problem you're solving. You try to find the pain point and then you present the possible solution. You ask about their honest opinion and you will be amazed by what kind of ideas they can give to you.

I can reveal to the whole method to idea validation/extraction that you can use to see if this is the right thing to develop and how you might shift it. Feel free to schedule a call with me if you're interested to learn more.