I created an account with Yahoo PPC Sponsor Ad with market USA and Canada some time ago. Under Tab “Administration†and “Master Accountâ€, Market : United States and Canada is clearly stated. Under Tab “Administration†and “Account“ , there is an item "Blocked Continents" with comments “Continents fro which you do not want traffic†I thought my market is USA and Canada so I did not take any action for this function, though I was aware of this function. Later I got a shock to find out clicks form USA/Canada are only 5 % and 95% are from ALL OVER THE WORLD and I wasted money for this. I got to “Blocked Continents†and I blocked continents Asia Europe Africa South America Australia. Yahoo told me I did the right thing to specify those continents, but they told me they cannot guarantee. They are right. I still have clicks mainly form South America and Mexico and occasionally Indonesia, India ,Vietnam etc SO my estimate is still currently 70 % from USA/Canada and 30% from other countries. Yahoo told me they cannot block 100% traffic from outside USA/Canada. I would appreciate if real experts in this forum could enlighten me in plain English how country/market target works and why they cannot block 100%. Also what about Google Adwords? Are they the same as Yahoo or better?