With 3,07 billion monthly active users, Meta (Facebook + Instagram) remains the most powerful advertising platform for reaching your ideal customers. The average CPC is 2 to 5 times cheaper than Google Ads in some sectors. But between Business Manager, audiences, formats and the algorithm, it is easy to waste your budget.
At ConvertiLab, we run Meta Ads campaigns for our business-owner clients. The campaigns that perform best share the same 4 fundamentals: good targeting, authentic visuals, a properly installed Pixel, and patience during the learning phase.
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How is a Meta Ads campaign structured, and which objective should you choose?
A Meta Ads campaign works on 3 levels: the Campaign (the overall marketing objective), the Ad Set (targeting, budget, schedule) and the Ad (visual, text, CTA). The campaign objective is crucial, because it determines how Meta's algorithm optimises delivery: choose "Leads" if you want contact forms, "Sales" for e-commerce, "Traffic" to bring visitors to your site, and "Awareness" to maximise reach. One point that often gets overlooked: changing objective mid-campaign resets the learning, so decide before you launch and keep the objective for at least 2 weeks.
The 6 Meta Ads campaign objectives and what each one is for:
How do you target the right audiences on Meta Ads to maximise ROAS?
Targeting is Meta Ads' main strength next to Google Ads: you reach people by their interests and behaviours, not only by their searches. The 3 best-performing audience types are Core Audiences (location, age, interests, ideal to start with), Custom Audiences built from the Meta Pixel (your site visitors and existing customers, the most qualified of all), and Lookalike Audiences (Lookalike 1%, where Meta finds profiles resembling your best customers).
The audience strategy we recommend for a small business:
Lookalike audiences at 1% often deliver the best ROAS. Widen gradually to 2-5% if you need volume.
The power of retargeting: someone who has visited your site without converting is 8 times more likely to convert than a cold prospect. With the Meta Pixel installed, you can target the people who visited your pricing page in the last 30 days specifically, and this very warm segment converts at a cost that is often 5 to 10 times lower than cold audiences. It is the most profitable retargeting strategy available to a small business.
How do you structure a profitable Meta Ads campaign from A to Z?
For a small business starting with 500€/month, here is the campaign structure ConvertiLab recommends:
Campaign 1, Prospecting (70% of the budget):
Campaign 2, Retargeting (30% of the budget):
This simple but effective structure covers every stage of the funnel without spreading the budget across too many objectives.
Which Meta Ads formats deliver the best cost per result in 2026?
In 2026, Reels Ads, the full-screen vertical format, deliver the best cost per result on Meta thanks to their priority distribution on Instagram and Facebook. Videos of 15 to 30 seconds get the best results, and the first 3 seconds decide whether you hold attention. Carousels, with up to 10 images, are ideal for presenting several services or products. Single images with authentic visuals, rather than stock photos, consistently outperform visuals that look too much like advertising.
Key metrics for monitoring your Meta Ads campaigns:
| Metric | Target | What it means |
|---|---|---|
| CTR | > 1% | Visual quality + targeting relevance |
| CPC | Depends on sector | Cost per click |
| CPM | < 15€ | Cost per 1 000 impressions |
| ROAS | > 3x | Return on ad spend |
| Frequency | < 3 | How many times one person sees the ad |
How do you set up the Meta Pixel and avoid the classic beginner mistakes?
The Meta Pixel is a piece of JavaScript you install on your site to track what visitors do: a visit, a lead, a purchase. Without the Pixel you cannot measure conversions, build custom audiences or optimise for a sales objective. It is the first thing to do before you launch a campaign. Install it through Google Tag Manager, which is the simplest route, or directly in your site's code.
The 5 most common Meta Ads mistakes among beginners:
A ConvertiLab case: a career-change coach was spending 500€/month on a core audience of 1,2 million people. ROAS: 1,4x. After restructuring, with a Lookalike 1% audience built from her 280 Stripe customers and the budget concentrated on retargeting site visitors from the last 90 days, the ROAS reached 4,2x within 4 weeks. The secret? Meta's algorithm learns better on a small, qualified audience than on a broad cold one.
Frequently asked questions about Meta Ads
Facebook Ads or Instagram Ads: which should you choose?
Both. Meta Ads lets you run on the two platforms at once, and the algorithm shifts the budget towards whichever one performs better for your objective. Instagram performs better for visual products and e-commerce. Facebook performs better for B2B services and audiences aged 35 and over. Start with both placements switched on, then adjust according to the data.
What is the minimum budget to start with Meta Ads?
Expect a minimum of 300€/month to get meaningful data. With 500 to 1 000€/month, you can test several audiences and creatives properly. The learning phase, before the algorithm is optimised, needs 50 conversions a week, and on too small a budget that phase drags on far too long.
Does Meta Ads work for B2B companies?
Yes, above all through custom audiences and retargeting. Targeting by job title, industry and company size lets you reach decision-makers. For pure B2B, LinkedIn Ads is often more effective, but Meta Ads reaches those same decision-makers at a far lower cost through lookalike audiences built from a customer list. A common B2B strategy is to use Meta Ads for low-cost awareness and traffic, then qualify and close through LinkedIn or email.
How do you test your Meta Ads creatives properly?
Use the "Creative Testing" feature in Meta Business Suite, or test manually by building 3 to 5 variants inside the same ad set. Change one element at a time, whether the visual, the hook or the CTA, so you can see what makes the difference. Let each test run for at least 2 weeks and 2 000 impressions before you draw conclusions. The image or the video accounts for 70% of a Meta ad's performance, so test the visuals first, before you touch the text. !Meta Ads creative testing - A/B test visuals, hooks, CTR, performance, 70% image
