Parallax Scrolling and SEO: What You Should Know Before Designing a Website, from ClickZ.
Parallax websites look great when done properly, but need to be well structured to maintain search channels, and remain user-friendly.
When Ian Coyle designed the first mainstream example of parallax scrolling back in 2011 and named it Nike Better World, the website became one of the hottest topics of discussion in the digital world for several months. It became a trendsetter and got featured in numerous website design galleries. Everyone appreciated the great idea and the idyllic design.
However, there is a lot of confusion in the SEO community today regarding whether to use parallax or not. Since, most of the parallax websites have one-page architecture, we end up believing that parallax scrolling is restricted to one-page Web design.
Now, because your entire site is featured on a single page, it makes such a site unfriendly for SEO. There is a lost potential to incorporate meta data, you cannot target specific keywords on each page, there are multiple H1 headers on a single page each competing with one another, and it takes a long time to load because it is image-heavy. But does this mean you always have to compromise on good design for a powerful SEO? Obviously not.