To sum up a few points:
1. Thin content above-the-fold is not one of the best practice in exercising good user experience. Although Google agreed that placing ads above-the-fold as a means to monetize website, it encourages us to have concrete and relevant content for users to read in the first few lines on the page.
This algorithmic change does not affect sites who place ads above-the-fold to a normal degree, but affects sites that go much further to load the top of the page with ads to an excessive degree or that make it hard to find the actual original content on the page.
2. Effort to tweak the site fulfilling one of two rules out of these 500 algorithms to be launched this year are not advisable. Google has over 500 search algorithmic change this year, the best approach of being indexed or getting high ranking in Google sesarc result page is to make our sites useful, usable and content rich.
3. Suggest using Google Browser size tool to check out how our site look like under different screen resolutions. At stake is how to have a good balance of content and advertisement, Google webmaster blog does not specify the details. It however recommend us to check our sites under different screen resolution. Search engine land has a post to explore this issue.
Within a month, Google unveils more details about on-page search optimization for us. About a week ago, it posted how to page title can make search results better.