LinkedIn Ads First Run: What Worked, What Flopped

Executive overview

Copy Hackers ran LinkedIn ads for the first time to support a Copy School launch, running both a lead gen and a conversion campaign. Costs shocked them — not because they were high, but because their LinkedIn rep revealed leads were five times cheaper than the platform average. The core insight is that LinkedIn's granular targeting and trusted professional context create unusually high-intent audiences, but cold-audience conversion campaigns rarely work — warm retargeting is where LinkedIn earns its premium. Testing creative variants is non-negotiable: their best performer was four times cheaper than their worst.

Why LinkedIn over other platforms

• Most trusted social platform year-over-year (Insider Intelligence), driven by privacy and security perceptions
• Users are in an information-seeking mindset, not entertainment mode — suits B2B and education offers
• Granular targeting goes deep: job title, function, seniority, company size, and more — described as a "Russian nesting doll" of options
• Copywriter audience alone: 1.7 million reachable on the platform

Lead gen campaign: Mini Copy School

• Offer: free Mini Copy School, delivered via a native LinkedIn lead gen form (auto-populates email, low friction)
• Copy is heavily constrained — roughly 70 characters above the image, so messaging must be ultra-tight
• Two carousel ad variants tested; the simpler, curiosity-driven "guessing" message (Ad A) beat the wordier value-list variant (Ad B) by 4x on cost-per-lead
• The winning ad used a problem → curiosity → offer structure, kept to two short ideas, and matched exactly what Mini Copy School delivers
• The losing variant asked users to read too much — LinkedIn users want value but won't absorb dense copy mid-scroll

What the LinkedIn rep revealed

• After the campaign, a LinkedIn ad rep reached out and reframed the results: the team's "expensive" leads were actually five times cheaper than the LinkedIn platform average
• Even so, their worst performer was five times more expensive than equivalent Facebook leads
• LinkedIn claims lead quality is significantly higher than Facebook — still being monitored
• Cold audience → immediate conversion ask was likely too short a nurture window to validate quality

Conversion campaign: Copy School launch

• Three audience segments: freelance copywriters, in-house marketers, small business owners — each with tailored messaging and separate funnels
• Audiences included cold targeting, website visitors, LinkedIn followers, and email list
• Rule: let campaigns run 24 hours untouched to let the algorithm find its footing
• Most cold-audience conversion campaigns were shut down after 24 hours due to poor results
• One retargeting ad with an 8% click-through rate was kept running — it delivered 67% of total conversions on day six alone
• Cost per conversion on that retargeting campaign was nearly 10x cheaper than Facebook

Three takeaways

• Shift to long-term lead gen: short, high-spend bursts don't suit LinkedIn — slower, sustained campaigns that find targeting sweet spots perform better
• Warm audiences + strong offer = LinkedIn's sweet spot: organic followers already know you; hitting them with a compelling offer converts well; cold-audience conversion campaigns are not recommended
• Analyse everything: performance gaps between nearly identical creatives are large; build hypotheses on why things worked or failed, and use that to shape the next test

Practical notes for first-time LinkedIn advertisers

• Always test multiple creative variants — assume you don't know what will win
• Match ad creative tightly to the offer; qualified clicks matter more than raw volume
• Video ads allow retargeting based on watch percentage; carousel viewers cannot be retargeted — factor this into budget decisions
• Native lead gen forms reduce friction but severely limit copy length; factor this into message strategy
• LinkedIn's benchmarks are different from Facebook's — get context from platform norms before judging results