Seed Audience
The source list of real people you give Meta so it can find more people like them. Your seed is usually a custom audience: past buyers, email subscribers, website visitors, or people who engaged with your content. Meta studies that group and builds a lookalike from it.
No seed, no lookalike. The quality of the people you find depends entirely on the quality of the people you start with.
Seed audience vs lookalike audience
These two get mixed up constantly, so here is the clean split:
- The seed audience is the input. It is your real, known group of people.
- The lookalike audience is the output. It is the new, larger group Meta builds by matching traits from your seed.
You create the seed. Meta creates the lookalike. One feeds the other.
| Seed audience | Lookalike audience | |
|---|---|---|
| What it is | Your source list | New people Meta finds |
| Who makes it | You | Meta's algorithm |
| Size | Small and specific | Large and broad |
| Example | 5,000 past purchasers | 2 million similar profiles |
What makes a good seed
Size and signal both matter. Meta suggests at least 100 people from a single country, but the results get better with more.
- Aim for 1,000 to 50,000 people. Enough for Meta to spot real patterns, not so many that the signal gets diluted.
- Use your best customers, not all customers. A seed of high-value buyers beats a seed of everyone who ever visited.
- Keep it recent. A list of people who bought in the last 180 days reflects your current product and offer better than a three-year-old export.
Garbage in, garbage out applies here. A weak seed produces a weak lookalike, no matter how good the targeting looks.
Common seed sources
- Customer or purchaser lists uploaded as a custom audience
- Website visitors captured by the Meta Pixel
- People who added to cart or started checkout
- Email subscribers
- Video viewers or people who engaged with your page
FAQ
What is the difference between a seed audience and a lookalike audience?
The seed audience is the source list of real people you provide. The lookalike audience is the new, larger group Meta builds by finding people who share traits with your seed. You make the seed, Meta makes the lookalike.
How big should a seed audience be?
Meta's minimum is 100 people from one country, but 1,000 to 50,000 works far better. A larger, higher-quality seed gives the algorithm more signal to match against.
Can I use website visitors as a seed audience?
Yes. Website visitors captured by the Meta Pixel are a common seed, along with customer lists, cart abandoners, and email subscribers. Higher-intent sources usually produce stronger lookalikes.
Does a better seed audience improve performance?
Usually, yes. A seed of your best, most recent customers tends to produce a lookalike that converts better than one built from a broad, generic list.