Access Control

Hi guys / gals.

Is there a way to use usermanager like a proxy? What I mean is for example on a proxy you have access control, which you can block certain websites and allow everything else, or block everything and only allow certain sites.

I would like to know if there is maybe some form of control in that sense using RouterOS?

The clients would be connecting via PPPoE and tracked with userman, but now I want to stop certain sites.

Regards,
Darren