Yes, in fact that’s a very effective way of validating your product idea before committing time and money into it. Apart from just a plain confirmation of interest in your product, using Facebook Ads tells you more: the prospects’ willingness to buy your product. You can also use the audience targeting options in the Facebook Ads to get your ads in front of the right eyes. This will minimize the number of users seeing your ad but give you a better picture of potential conversions. Being able to target a specific audience based on their age ranges, connections, interests, behaviors and locations means you have a lot of power. Moreover, with the latest algorithm changes, Facebook Ads help you reach more people that a normal Facebook post would.