Facebook ads UTM parameters
and GA4 tracking.

Open the ad (not the campaign or ad set), scroll to the Tracking section and find URL parameters. Paste the parameters there, without the question mark, rather than adding them to the website URL itself. Meta then adds them to the link automatically, and the URL people see in the ad stays clean. There is also a Build a URL parameter option that fills in the fields for you.

Add them before you publish. Meta’s own help pages warn that changing URL parameters after an ad is published may send the ad set back into the learning phase, so it is better to get them right first. If you use the same parameters on every ad, save them once and copy them, or duplicate a tagged ad when you make a new one, so nothing goes out untagged.

Test the link before you spend. Use the ad preview, click through to the website, and check the address bar shows the parameters. Then open the real-time report in your analytics and confirm the visit arrives with the right source and medium. It takes two minutes and saves weeks of untracked data.

Our default string is utm_source=facebook&utm_medium=paid_social&utm_campaign={{campaign.name}}&utm_content={{ad.name}}&utm_term={{adset.name}}. We use one fixed source for all Meta ads rather than {{site_source_name}}, because a fixed value is easy to filter and analytics tools reliably recognise “facebook” as a social source. If a client wants to split Facebook from Instagram, we add {{site_source_name}} or {{placement}} as an extra parameter and check how it appears in their reports.

The medium matters more than people think. Google Analytics 4 puts a visit in its Paid Social channel when the source is a social site and the medium matches a pattern such as cpc, ppc, retargeting or anything starting with “paid”. paid_social fits that pattern. A medium like “facebook_ads” or “social” does not, so those visits end up as Organic Social or Unassigned.

Keep names readable and consistent, because they become your reports. A campaign called Leads_Sliema_Nov and an ad called Reel_offer_v2 tell you something at a glance; New Campaign (copy) (copy) does not. Use lowercase or one fixed style, avoid personal details in any parameter, and agree the naming with whoever builds the ads.

This is the question we hear most. For the same week, Ads Manager usually shows more link clicks than GA4 shows sessions from facebook / paid_social, and often a different number of purchases or enquiries. Neither tool is broken. They count different things in different ways, and the gap is normal.

Clicks are not sessions: a link click is counted even if the page is slow, the person taps back, or the in-app browser closes before analytics loads. Attribution differs too. Meta credits a purchase to its ad if it happened within the ad set’s attribution setting, which can include one day after someone viewed the ad without clicking. Analytics only sees the visit it can track, gives credit across every channel, and uses its own model and window. If someone clicks your Instagram ad on Monday and comes back through a Google search on Thursday to book, Meta and Google can both claim the booking.

Then there is consent. Under EU rules, visitors who decline analytics cookies may not be recorded at all, depending on how your consent banner and Consent Mode are set up. Instant forms and click-to-WhatsApp ads never reach your website, so analytics cannot see those leads. And people switch devices. Read each tool on its own terms, look at trends rather than single days, and use your CRM or till for the final word on what was sold.

Many Meta campaigns in Malta never send anyone to a website. A clinic collects enquiries through an instant form, a contractor runs click-to-WhatsApp ads, a restaurant takes bookings by phone. UTM parameters do nothing for these, because there is no page view to tag. That is fine: the lead is counted in Ads Manager, and the important tracking happens next, in your CRM or wherever leads arrive.

For lead forms, record the campaign and ad with each lead, which Meta includes when leads are sent to a CRM, then mark what happened: called, booked, bought. For WhatsApp, use a pre-filled first message that names the offer, so you know which ad started the chat. Our guides to Facebook lead ads and click-to-WhatsApp ads cover both.

Where the website is part of the journey, a mix works well: the ad sends people to a landing page tagged with UTMs, and the page offers a form, a WhatsApp button and a phone number. Tag the WhatsApp and call buttons as events in analytics, so you can see how many Meta visitors chose each route.

Putting the parameters on the website URL and also in the URL parameters field, so they appear twice. Using a different source on every ad (“fb”, “Facebook”, “facebook.com”, “meta”), which splits one channel into four rows. Choosing a medium that analytics does not recognise as paid, so the visits fall into Organic Social or Unassigned. Renaming campaigns after publishing and wondering why analytics still shows the old names.

Two more are worth avoiding. Never put personal data, such as an email address or phone number, into a URL parameter; it ends up in analytics and in Meta, and that is a privacy problem. And do not tag links in your normal, unpaid posts with paid_social, or your organic results will be counted as ads. Use a different medium, such as social, for those.