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Looking for any insights regarding experience with optimization and HTML5 websites that use parallax scrolling making the website only one page (single unique URL). If done right, I've seen a number of these sites with great UX, clean design and nice layouts, but it comes down to only being able to optimize a single page. Does Google view single page sites as less authoritative? I'll open the floor to any comments at all about this. Thanks in advance Mozzers.

I work on SEO for a number of clients at our agency, including our in-house SEO for our own website. I use Open Site Explorer all the time to analyze my competition in the SERPs and try to gain links from this insight. However, I've noticed a number of agencies and design shops that place a link in the footer of websites they've designed and created. For example "Site design by ABC Agency (hyperlinked to the agency's home page). Or I've seen small logos or graphics that link to the designer's site and use the "alt tag" to get stronger anchor text. From a design perspective, I don't care for this, but as a SEO...I can see why. We've designed a number of websites and have more in the pipeline, but have not used this tactic before. It seems like an irrelevant link from a content/user standpoint, however, it seems to work for a lot of agencies and design shops. Any input from the SEOmoz community would be great. Is it a short-lived strategy? Does it help or hurt your link-building and "rapport" with Google, Bing, Yahoo? Thanks everyone.