Campaign is not visible to every follower of targeted user

[lucky8139]

I created a app install campaign and set the targeting criteria for follower of a user. Campaign is running successfully but not visible to every follower. Targeted user have 108 follower but reach estimate count is 60. Please help

[trace]

You pay a bid for each time your ad shows to users. If someone outbids you then their ad(s) show to them instead. It’s pretty hard to get every single person since there’s always people/companies trying to reach as many users as possible. If you’d really like to reach all their followers you’ll need to increase your bid.

[andrs]

@lucky8139 the count returned by the reach estimate endpoint is that of active matched users. In this case, the targeted use has 108 followers but only 60 of those are active - hence why the number is smaller.