Ghost user retargeting: fake installs on retargeting campaigns
Retargeting campaigns targeting users from fake installs serve ads to ghost users who never genuinely installed your app and can never re-engage. Tapper removes fake install users from your retargeting audiences so your re-engagement budget reaches real lapsed users.
Trusted by leading brands worldwide
Fake install users turn your retargeting audiences into ghost user pools
Ghost user retargeting is a downstream consequence of fake installs that many mobile advertisers underestimate. When fake installs, whether from SDK spoofing, device farms, or click injection, enter your MMP and populate your user database, those phantom users become eligible for retargeting campaigns once they pass the install recency threshold. Your retargeting campaigns then actively serve ads to users who never existed as genuine customers, consuming re-engagement budget on an audience that can never respond because they are not real people. Every impression, every click, and every ad served to a ghost user is pure waste with zero chance of genuine re-engagement.
The scale of ghost user retargeting depends directly on your fake install rate. If 28% of your installs are invalid globally, and those installs accumulate over multiple months of campaign activity, a significant portion of your retargeting audience may consist of ghost users. Tapper addresses this upstream by removing fake installs at the install layer before they enter your user database, and downstream by auditing existing retargeting audiences against invalid traffic signals to identify and suppress ghost user segments that have already accumulated from historical fake install traffic.
How Tapper stops fake installs on Mobile retargeting
Three steps from connection to clean campaign data, no engineering required.
01
Connect your MMP and retargeting stack
Tapper integrates with AppsFlyer, Adjust, Kochava, Singular, and Branch alongside your retargeting networks, auditing your install history and retargeting audience for fake install users.
02
Ghost users identified and removed from retargeting audiences
Tapper applies install-level traffic analysis to your user database, identifying device IDs, advertising IDs, and user segments associated with fake installs and suppressing them from your retargeting audience lists.
03
Retargeting budget reaches genuine lapsed users only
With ghost users suppressed from your retargeting audience, your re-engagement budget is allocated entirely to real lapsed users who have genuine purchase and engagement potential.
Fake installs on Mobile retargeting by the numbers
Data from Tapper's platform analysis and published industry research.
28%
Of mobile installs are invalid globally
$10B
Lost to invalid mobile traffic in 2023
40%
Of invalid mobile traffic uses SDK spoofing techniques
90%
SDK spoofing detection rate by Tapper
Tapper vs MMP built-in invalid traffic removal
Ghost user identification
Audits retargeting audience against fake install signals
No retargeting audience quality audit
Upstream fake install prevention
Removes fake installs before they enter user database
Fake installs populate retargeting audiences
Retargeting audience quality
Audience cleaned of ghost user segments
Ghost users remain in retargeting pool
Re-engagement rate accuracy
Re-engagement rates calculated on genuine users only
Ghost users dilute re-engagement metrics
Leading brands growing with Tapper
See how companies are protecting their ad budgets and improving ROI with Tapper.
13%
lower CPA
8.6%
higher order rate
“Tapper played a key role in improving the efficiency of Du's performance marketing activity by addressing traffic quality issues within campaigns. Following implementation, Du achieved a 13% reduction in CPA and an 8.6% increase in order rate, demonstrating a clear improvement in conversion quality and overall campaign effectiveness.”
Joseph Elbcherrawy
Client Leadership Director, Mindshare, a WPP Media Brand
14%
more conversions
11.4%
lower CPA
“We uncovered low-quality traffic that wasn't visible inside the platforms. Removing it delivered a 14% uplift in conversions and an 11.4% reduction in CPA, a meaningful efficiency gain for INFINITI's 2026 growth plans.”
David Barnes
Data & Technology Lead, Omnicom Group
40%
higher conversion rate
“When we take low-quality traffic out of the funnel before it reaches the algorithm, the campaign optimizes against cleaner signals and the efficiency comes through quickly. For AMA Nissan, that was a 40% lift in conversion rate and a lower CPA on Google, with nothing else in the setup changing. That is the kind of result we want to offer clients as a matter of course.”
Sohail Khan
Senior Performance Manager, WPP Media MENA
Frequently asked questions
Fake installs, whether from SDK spoofing, device farms, or click injection, generate install events that are recorded in your MMP user database alongside genuine installs. Those fake device IDs and advertising IDs accumulate in your user records and eventually qualify for retargeting campaigns based on your recency rules. Unless fake installs are identified and suppressed at the install layer, they automatically become eligible for retargeting.
Yes. Tapper can analyze your historical install data against invalid traffic signals to identify which device IDs and user segments in your retargeting audience are associated with fake installs. This retrospective audit produces a suppression list of ghost users that can be applied to your current retargeting campaigns immediately, improving the quality of your active re-engagement audience without waiting for new install data.
Ghost users never generate revenue because they are not real people. Every impression served to a ghost user and every click from a ghost user interaction (if a bad actor simulates clicks on retargeting ads) consumes budget with zero revenue potential. Your retargeting ROAS is suppressed by ghost user activity in proportion to the share of your audience that consists of fake install users. Removing ghost users from your audience improves your retargeting ROAS by concentrating spend on users who can actually re-engage and purchase.
Other invalid traffic types on Mobile app retargeting
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