Should UTM parameter values use dashes or underscores?

Dashes are the standard convention for UTM parameter values (e.g., spring-sale-2026 instead of spring_sale_2026). Dashes are more readable and GA4 treats them consistently. Avoid spaces — use dashes or underscores instead.

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What Are UTM Parameters?

UTM parameters (Urchin Tracking Module) are small snippets of text added to the end of a URL. When someone clicks your link, analytics tools like Google Analytics 4 read these parameters and record exactly where that visitor came from. For Facebook marketing, UTM parameters are essential for proving ROI and optimizing campaigns.

There are five standard UTM parameters:

utm_source — The platform sending traffic (e.g., facebook)
utm_medium — The marketing channel (e.g., social, cpc)
utm_campaign — Your campaign name (e.g., spring-sale-2026)
utm_term — Audience or keyword targeting (paid ads)
utm_content — Ad variant identifier for A/B testing

Facebook UTM Best Practices

Use Consistent Naming

Use lowercase and dashes throughout. Mixing cases (Facebook vs facebook) creates separate entries in GA4, making reports confusing and comparisons impossible.

Separate Paid vs Organic

Use utm_medium=paid-social for Facebook Ads and utm_medium=organic-social for regular posts so you can compare their performance in GA4.

Tag Every Campaign Link

Add UTM parameters to every link in every Facebook post, ad, story, and bio. Untagged links appear as "direct" traffic in GA4, masking Facebook's true contribution.

Use utm_content for A/B Tests

When running multiple ad variants or testing different creatives, use utm_content to differentiate them (e.g., image-v1 vs image-v2).

How to Track UTMs in Google Analytics 4

Open GA4 and navigate to Reports > Acquisition > Traffic Acquisition.
Filter by Source/Medium — look for facebook / social or facebook / cpc depending on your utm_medium value.
Add a campaign dimension — switch the primary dimension to "Session campaign" to see performance by campaign name.
Create an Exploration — use GA4's Explore feature to build a custom report combining source, medium, campaign, and content dimensions for a complete view.

Frequently Asked Questions

What are UTM parameters?

UTM parameters are tags added to URLs that tell analytics tools where your traffic came from. For example, adding ?utm_source=facebook&utm_medium=social to a link lets Google Analytics 4 categorize that visitor as coming from Facebook organic social.

What UTM parameters should I use for Facebook?

For organic Facebook posts: use utm_source=facebook and utm_medium=organic-social. For Facebook Ads: use utm_medium=paid-social or utm_medium=cpc. Always add a descriptive utm_campaign name.

How do I track UTM parameters in Google Analytics 4?

In GA4, go to Reports > Acquisition > Traffic Acquisition. UTM parameters automatically populate the Session source, Session medium, and Session campaign dimensions. For deeper analysis, use GA4's Explore feature to build custom reports combining all UTM dimensions.

Should UTM values use dashes or underscores?

Dashes are the standard convention (e.g., spring-sale-2026). They're more readable and GA4 handles them consistently. Most importantly, be consistent — pick one style and use it across all campaigns.

Can I use UTM parameters for Facebook organic posts?

Yes. UTM parameters work on any link you share on Facebook — organic posts, stories, Reels, bio links, and group posts. Use utm_medium=organic-social to distinguish free Facebook traffic from paid campaigns.

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