I will add to that - use FB ads just for retargeting, because it is relatively cheaper, and you know these are interested users. There is a cool YC startup ht

I will add to that - use FB ads just for retargeting, because it is relatively cheaper, and you know these are interested users. There is a cool YC startup https://www.perfectaudience.com/ https://www.perfectaudience.com/ that does just that.