Creating A Site for Contextual Advertising Begins with the Choice of Topics. The Main Thing is that Topic Is Competitive, So that Cost of Click Is High. Visitors Will Go to Your Site and Click on Advertising If it Intersts Them. To Increase Ctr, Many Mask The Advertising Link for the Menu. The Visitor, Without Dealing with Navigation, Clicks on AdverTting and Goes to the Advertiser Website.