I found this somewhere on blog (link)
If you have Mac you need to do (copied from my FB status update):
Open Terminal, sudo su -
ipfw add 1001 deny ip from 173.194.55.0/24 to me
ipfw add 1002 deny ip from 206.111.0.0/16 to me
ipfw list (to check status)
R
Does it block ads? If so, please don’t… I make some reasonable £££ from YouTube ads 
O yes, I forgot to put that one which removing ads from before video, as you remind me I try to find it 
R
ps. so everyone have to watch shampoo ad for your convenience?
If I do this will you be able to see me on my webcam? :w00t:
If you wish to benefit my videos at your convenience, yes
O God no, but if you missing something I can google to find few sites when you can put an advert and someone will look
R
:laugh:
