For the last year, we’ve been using mainly broad targeting and the results have always been better than using interest or LAL targeting. Facebook has a lot of data and if you just optimize for the correct actions and ensure you have a good ad account setup, the algorithm will basically do the job for you, i.e. find people who are most likely to convert. Just choose a country you want to advertise in and don’t use any age, gender, or placement restrictions. Facebook knows who is most likely to convert, you just have to set up everything correctly and tell FB what your primary goal is (conversions) so it can properly optimize and get you the best possible results.