Different members see different things

Hey,

Im making a membership website.

Id like to set some widgets to show ads on the website, but i would like different members who are signed up to see different ads of my choosing.

So if i chose member 1 to see advert abc member 1 would log in and only see advert abc, and if i chose member 2 to see ad xyz upon login member 2 would only see advert xyz.

Thanks