Web-Proxy: How to limit access to certain websites.

Hi to all,
I’m using RouterOS 4.9 and it’s webproxy ion transparent mode.
I would to limit the access at my users to certain categories of website. Is it possibile? In which way?

In webproxy access list it is possibile to allow or deny access to a site but if I would categorize it???

http://forum.mikrotik.com/search.php?keywords=%2Bblock+%2Bporn&terms=all&author=&sc=1&sf=all&sk=t&sd=d&sr=posts&st=0&ch=300&t=0&submit=Search

I assume you’re looking to block porn.

This worked for me when using web proxy.

/ip proxy access
add action=deny comment=“Block Facebook” disabled=no dst-host=facebook
add action=deny comment=“Block Youtube” disabled=no dst-host=youtube
add action=deny comment=“Block Twitter” disabled=no dst-host=twitter