Unfortunately you can’t collect IP addrssses from people who saw your ad though, because FB doesn’t let you :) You can of course though collect them if people

Unfortunately you can’t collect IP addrssses from people who saw your ad though, because FB doesn’t let you :) You can of course though collect them if people actually click on them and come to your website! This is also the case for non targeted ads mind you as it’s simply how the web works