Facebook is a powerful platform so that we can build a quality buyers list. But firstly, we need to find the buyers not freebie seekers or tire kickers to make friend with them. Here's the simple method:
We will look for the JVZoo, WarriorPlus products that have Facebook group for supporting. Once we buy the product, we will access the group and then we can send the friend requests to the members of the group.
Then we need to build relationship with them and sharing value to them.
People hate to be sold but they love to buy.
Do not pitch your product if it is not helpful for them. You need to find out the problem they may encounter and how your product helps them out.