How to Retarget People Who Watched Your Videos

Advertiser method. Meta does not publish this as a rule. The mechanics below come from Meta’s documentation; the method itself is common advertiser practice, and results vary.

Retarget video viewers when you already have videos that people have watched and a follow-up ad meant only for them, such as an offer or a lead form. It fits poorly when a video has few views, because the audience is built only from those views. Meta builds a video audience from people who watched on Facebook or Instagram, and you decide how much viewing counts and how long people stay in.

What does a video audience hold?

Meta says a video engagement custom audience is based on people who watch your video on Facebook or Instagram, including videos delivered to feed, stories and other eligible placements. You can choose up to 200 videos. Sources are a Facebook Page, an Instagram professional account, a campaign or a video ID, and you can combine videos from several professional accounts in one audience.

How much viewing should count?

Meta’s setup page gives one example, people who viewed at least 10 seconds of your video. The Meta pages cited here do not list the other thresholds or say which to choose, so check the options in Ads Manager.

The trade-off is yours to weigh. A low bar gives a larger audience that includes people who barely watched. A higher bar gives a smaller audience of people who stayed longer. Picking one is your call, not a Meta rule.

Which videos should go into one audience?

Meta lets you mix up to 200 videos in one audience, so grouping is your decision. You can group videos that set up the same offer, so the follow-up ad matches what viewers saw. That is method, not a Meta rule.

Two limits apply. Meta says videos used only in placement asset customization campaigns are not eligible, and Audience Network views may not be counted.

How long should people stay in the audience?

You set retention in days. Meta says people are removed after that period unless they engage with the videos again, and anyone who engages inside the period is added. The audience refreshes constantly, so you don’t need to rebuild it unless you change the period or the type of engagement. Meta’s 30-day figure is an example of how the mechanism works, not a recommendation.

A shorter period keeps the follow-up for recent viewers. A longer one keeps more people, including those who watched a while ago.

How big will the audience be?

Meta says the size depends on how the video entered your ad. A video uploaded during ad creation gives an audience that reflects the ad reach. A video taken from an existing post may reflect that post’s views instead. Meta’s example is a campaign with over 200,000 views whose audience is built from only 1,000, because the video was reused from a post.

What do you show them?

Meta says engagement audiences help you show ads to people who took these actions, and you can also use one as a lookalike source. What the follow-up says is up to you. You can tie it to what the video promised and leave out people who already converted.

How can you decide for your own videos?

List the videos that have real views, and note whether each was uploaded with an ad or reused from a post.
Choose a viewing bar you can explain.
Group videos by the message the follow-up continues.
Set a retention period, then check the audience status before using it.

FAQ

Can one audience cover Facebook and Instagram viewers?

Meta says a video engagement audience is based on people who watch your video on Facebook or Instagram. Instagram videos from several professional accounts can be combined in one audience, and you can add up to 200 videos from the sources Meta lists.

Why is my video audience smaller than my ad reach?

Meta says that when the ad used a video from an existing post, the audience size may follow that post’s views, not the ad reach. Audience Network views may also not be counted, and campaign reporting may differ. The audience and the report are separate numbers.

Do viewers stay in the audience forever?

No. Meta says people are removed after the retention period you set unless they engage with the videos again. New engagers are added. A quiet stretch with few views can therefore shrink the audience.