In our ongoing effort to help you find more high-quality websites in search results, today we’re launching an algorithmic change that looks at the layout of a webpage and the amount of content you see on the page once you click on a result.
Google’s search is going to start penalising pages without relevant content “above the fold”. While they don’t spell out what “above the fold” actually means (800px? more?), this should punish the more egregious use of pages top-loaded with advertisements.