Lookalike from video viewers

Quick Answer

A lookalike from video viewers is the cheapest seed you can build on Meta — you just need a video that earns views. Use 75% video viewers as your seed (not 25% or 50%) because watching three quarters of a video signals genuine attention. Combine with a 1% lookalike for prospecting at scale. This works especially well when your pixel data is thin or you are launching a new brand without purchase history.

Why video viewer lookalikes work

Meta loves video. View events are cheap to generate, do not require website traffic, and create a custom audience that the platform tracks natively. When you build a lookalike from people who watched 75% of your video, you are telling Meta: "these are people who paid attention to my brand for at least a few seconds." That is a meaningful signal.

Video viewer lookalikes are particularly powerful for:

New brands without enough pixel or purchase data

Pre-launch campaigns building waitlists

Local businesses with small geographic targets

Awareness-stage funnels

Step-by-step setup

Make a 30 to 60 second video. Long enough that 75% completion means real engagement, short enough to be cheap to deliver. Vertical 9:16 for Reels and Stories.
Run a video views campaign. Objective: Engagement → Video Views. Optimise for ThruPlay. Budget: £20 to £50 per day, broad audience.
Let it run for 7 to 14 days to build a meaningful pool of viewers.
Build the custom audience. Audiences > Create > Custom Audience > Video. Select "People who watched at least 75% of your video." Choose the video you ran.
Build a 1% lookalike from this custom audience. Name it LAL_1%_Vid75_v1.
Use the lookalike in a separate prospecting ad set. Same creative or new creative — test both.

Real examples

Pre-launch Kickstarter for a smart water bottle. Spent £400 running a 45-second product reveal video. Built a 75% viewer custom audience of 8,200 people. Lookalike CPA on the eventual launch was £4.20 per email signup vs £9.80 for an interest-based lookalike. The £400 spent on video views paid back 50x.

Local fitness studio. Ran a 60-second studio tour video to a 10-mile radius. Built a 75% viewer audience of 1,400 people. The 1% lookalike (limited to the same 10-mile radius) drove £6 trial signups vs £14 from cold interest targeting.

DTC skincare launch. Used a 30-second product education video. Generated 12,000 75% viewers in two weeks. Lookalike CPA on the prospecting campaign was 35% lower than the interest-based control group.

Which view percentage to pick

3 seconds: Almost no signal. Avoid for lookalikes.
25%: Weak signal. Useful for retargeting only.
50%: Decent signal but biased toward people with autoplay habits.
75%: The sweet spot. Watching 75% of a 45-second video is 34 seconds of attention.
95%: Very strong signal but the audience is too small to build a meaningful lookalike unless your video has millions of views.

When video viewer lookalikes beat pixel lookalikes

You are launching a new brand and have less than 500 pixel events
You operate in a country with limited iOS tracking
You want to build top-of-funnel audiences cheaply
You sell a high-consideration product that benefits from storytelling
Your website conversion volume is low but social engagement is high

What kills video viewer lookalikes

Boring videos that nobody watches past 5 seconds
Videos optimised for views with bait-and-switch openings (you get fake viewers)
Tiny audiences (under 1,000 viewers at 75% completion)
Using 25% completion as the seed (signal is too weak)

FAQs

Can I combine multiple videos into one custom audience?
Yes. The video custom audience tool lets you select multiple videos at once. This is a smart way to build a bigger seed faster.

How long do video viewer audiences last?
Up to 365 days. But fresh viewers (last 30 to 90 days) give the best lookalike signal.

Do Reels viewers count?
Yes. Reels, Stories, and feed videos all populate the same video custom audience.

Do I need a paid ad to build the seed?
It is much faster, but organic video views also count if you have an engaged page.

Can I use this for B2B?
Yes. A LinkedIn-style explainer video targeted at industry interests works well. The lookalike will skew B2B-friendly if your video does.

Make videos that earn the view

A video viewer lookalike is only as good as the video that built it. Pix-Vu tests your video creative — hooks, openings, and CTA frames — against real viewer reactions so you ship videos that hold attention long enough to fuel your lookalikes. Try Pix-Vu free at https://pix-vu.com.