What goes into utm_source for TikTok and LinkedIn Ads — Google's official list h

This story carries a 57% reliability rating — developing, not confirmed, built from a single signal picked up on Dev.to on May 17th. One source, one data point. Read the original piece there before drawing conclusions.

The question sounds mundane until you actually try to answer it: what do you put in the utm_source parameter when you're tracking TikTok or LinkedIn Ads in Google Analytics? On May 17th, a developer posted to Dev.to noting that Google's official UTM source list — the canonical reference document that marketers and developers have leaned on for years — contains only five rows. Five. For a tracking system that underpins billions of dollars in advertising attribution across dozens of platforms, that's a document that stopped growing somewhere around the era when "social media" meant Facebook and Twitter. The post highlighted the specific gap for TikTok and LinkedIn Ads, two platforms that have become essential budget lines for performance marketers, yet exist in a kind of official ambiguity when it comes to standardised source naming. The result is the quiet chaos that lives inside every marketing team's spreadsheet: tiktok, TikTok, tiktok_ads, linkedin, LinkedIn, li — all meaning the same thing, none of them officially right.

If confirmed as a genuine gap in Google's documentation rather than a misreading of it, here is what this means. Every company running multi-platform campaigns is likely sitting on attribution data that cannot be reliably compared across teams, agencies, or time periods, because no one agreed on the source string and no authority told them to. The second-order effect is worse: if you're feeding UTM data into any automated reporting or AI-driven attribution model, inconsistent source naming corrupts the inputs before analysis even begins. For vibe coders and growth engineers building internal dashboards or lightweight analytics stacks, this is exactly the kind of invisible standard gap that causes a project to quietly fail three months after launch. Google's silence here isn't neutral — it's a vacuum that every individual developer fills differently.

Watch for either a quiet update to Google's official UTM parameter documentation adding TikTok and LinkedIn as named sources, or a broader community push — perhaps through GA4 forums or the Google tag team — to formalise what the industry has already decided by convention.

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