Now, we have introduced two useful features, but one thing to be careful of when using these features is audience overlap .
The values shown by the "Audience oman phone number material Settings" and "Estimated Daily Reach" functions are only for individual ad sets . In other words, if the same audience settings are mixed between multiple ad sets, overlaps will not be taken into account , so if you do not use these functions with the correct understanding, you may misjudge the number of audiences and the number of reaches.

If you design your ad sets with the wrong understanding, it could result in unstable ad delivery and poor performance.
This is because the number of target users is shown in advance as a specific number, so you can use that as a basis to estimate impressions, clicks, and even conversions. Then, the advertising budget will be calculated from each of these estimates, and the campaign will be created based on that.
If you have a wrong understanding of these numbers, you may end up wasting your budget, or your reach may be lower than expected, causing frequency to increase too quickly, lowering CTR and raising CPC, leading to unexpected results.
In addition, Facebook Ads has a limit on the number of times an ad from the same advertiser can be displayed to a single user in a short period of time . Therefore, if there is overlap in audiences, the system will prioritize ads that have performed better in the past, which can result in a biased delivery to the ad set to which that ad belongs, and one of the ad sets may not be able to use its budget as desired (i.e. the ad will not be delivered).
As you can see, proper account design is crucial to gain as much control as possible over your ad performance, and unintentional audience overlap can be disastrous.
So, to avoid this audience overlap issue as much as possible, we 'd like to introduce a feature called "Overlap" .