Shape or blocking web adress

HI,
am new to mikrotik so forgive me on my noob question. Is it possible to block certain web adress for example youtube or facebook using winbox aplication. I know how to block certan IP on my LAN but how to block adress i really cant figure it out.

Thanks

P.S: sorry on my bad english :slight_smile:)

http://wiki.mikrotik.com/wiki/How_to_Block_Websites_%26_Stop_Downloading_Using_Proxy