BMF.io publishers usually kill it with retargeting by using tracking pixels (like Facebook or Google) to follow people who clicked but didn't buy. Then, they hit them with ads later to remind them—like, "Hey, remember this cool thing?" They also group people based on what they did. Each group sees different ads that feel more personal. They will show you ads on Instagram, Google, even email. They space out ads so you don't get annoyed.