If your web site has been optimized to come out at the top of Google searches by someone who is highly knowledgeable about SEO (search engine optimization), you may want to be aware of these comments made by a Google executive:

Not so fast SEO, Google wants to punish “overly optimized” sites | VentureBeat

If you're not an SEO professional and you haven't used one to help you tweak your site, you probably don't have much to worry about. The dancers who should be the most concerned are those who designed their sites to "impress" the crawlers (automated programs that examine sites and determine how to rank them) rather than designing their sites to "impress" real human beings.