If you’ve spent any time in Meta Ads Manager, you’ve seen the option to create a “lookalike audience” and probably wondered whether it’s worth the fuss. The short answer: used well, lookalike audiences are one of the most reliable ways to scale a campaign beyond the people who already know you. Used carelessly, they quietly drain budget. This guide explains what lookalike audiences are, how to build good ones, and how Singapore advertisers should think about them in practice.
What a lookalike audience actually is
A lookalike audience is a new group of strangers that the platform believes resembles a group you already value. You give Meta (or a similar feature on TikTok) a “source” — say, your past purchasers — and it analyses the traits and behaviours those people share, then finds others who look similar across the wider user base.
The crucial idea: you’re not telling the platform to target “women, 25–34, interested in skincare.” You’re handing it real examples of your best customers and letting its modelling find more people like them. When the source is good, this often beats anything you could define by hand.
The source decides the quality
A lookalike is only as good as the audience it’s built from. Garbage in, garbage out. The best sources are the ones closest to real value:
- Purchasers — a lookalike of people who’ve actually bought is usually the strongest, because it models real buyers.
- High-value customers — upload a list of your best repeat customers and you can find more high-spenders, not just any buyer.
- Add-to-cart or lead events — useful when you don’t yet have enough purchases to model from.
- Engaged audiences — video viewers, page engagers and site visitors work as a softer source when conversion data is thin.
A weak source — “everyone who visited the homepage once” — produces a vague lookalike. A sharp source — “people who bought twice in the last 90 days” — produces a precise one. Build the best source you can before worrying about anything else.
You need enough data first
Lookalikes need a meaningful number of people in the source to model reliably — a handful of conversions isn’t enough. For a newer Singapore SME, this is the catch: if you’ve only had a few dozen sales, your purchaser lookalike won’t have much to learn from.
The workaround is to build lookalikes from larger, upper-funnel sources first — video viewers or site visitors — while your purchase data grows. As sales accumulate, you graduate to purchaser-based lookalikes, which tend to perform better. We help clients sequence this as part of performance marketing, so the targeting matures alongside the data.
Sizing: how broad to go
When you create a lookalike, you choose how closely it should match the source — typically expressed as a percentage of the country’s users. A 1% lookalike is the tightest match; larger percentages widen the net but dilute the similarity.
For a market the size of Singapore, this matters more than in a big country, because a small percentage of a small population is a small audience. Practical guidance:
- Start tighter (the closest match) for the most precise targeting and best quality.
- If the audience is too small to spend efficiently, widen the percentage gradually.
- Test a tighter and a broader version against each other and let cost per result decide.
In a compact market, you may also broaden by combining Singapore with nearby regions only if your business genuinely serves them — otherwise keep it local and accept a smaller, sharper audience.
Lookalike audiences in the funnel
Lookalikes are a top-and-middle-of-funnel tool — a way to reach fresh, qualified strangers. They are not a substitute for retargeting. The smart structure runs lookalikes to find new prospects, then retargets the ones who engage with warmer, closing messages.
Think of it as: lookalikes fill the top of the bucket with the right people, retargeting converts them at the bottom. Used together inside a proper social funnel, they let you scale reach without your costs ballooning. You can see the kind of creative we pair with this targeting across our work.
Privacy and custom audience uploads
If you build lookalikes from a customer list, remember Singapore’s PDPA. You should have a lawful basis to use customer contact details for advertising, and your privacy policy should make clear that data may be used for marketing. Treat customer data responsibly — it’s both the law and good practice. When in doubt, build lookalikes from on-platform behaviour (engagement, site visits via your pixel) rather than uploaded lists.
Common mistakes to avoid
- Building from a weak source — a vague audience in means a vague audience out.
- Going too broad too soon — the widest lookalike isn’t the best; precision usually wins on cost per result.
- Forgetting to refresh — as your customer base grows and shifts, rebuild lookalikes from current data so they stay relevant.
- Treating them as retargeting — they reach strangers; pair them with retargeting to actually close.
Frequently asked questions
How many people do I need to create a lookalike audience?
You need a reasonable minimum in your source for the platform to model reliably — a few conversions won’t do. If your purchase data is thin, build lookalikes from larger sources like video viewers or site visitors first, then move to purchaser-based ones as sales grow.
What’s the best source for a lookalike audience?
Usually your actual purchasers, and ideally your highest-value or repeat customers. The closer the source is to real revenue, the better the people the platform finds. Engagement-based sources are a solid fallback when conversion data is limited.
Should I use a 1% or a broader lookalike in Singapore?
Start tight for precision, then widen only if the audience is too small to spend efficiently. Because Singapore’s population is small, a narrow percentage can be a narrow audience, so test a tighter and broader version and let cost per result decide.
Are lookalike audiences enough on their own?
No. They’re for finding new prospects at the top of the funnel. To convert efficiently, pair them with retargeting that re-engages the people who showed interest.
Want targeting that scales without waste? Tell us about your business and we’ll build the audiences and creative to match.
