Last week Google changed it’s algorithm in an effort to penalize sites who are ad heavy and content weak. This has been an ongoing effort since the Panda update last February.
This new change will only affect 1% of the searches globally, so you might not notice it. But if you are in that 1% you should reconsider how many ads you have running above the fold.
Above the fold advertising is lucrative for many people. Overwhelming readers with several ads above the fold and little to no content will hurt you when it comes to SEO as well as annoy your readers.
You can use this browser size tool to see what your webpage looks like under different screen resolutions.
You can read more about this update on Google’s search blog.
