An item belongs to a potentially infinite number of categories (usually most of them are spam).
After the item page loads, it shows one category link with the highest score (and thus probably non-spam) of all categories the item belongs to. There is
More... is pressed twice, 20 categories would be loaded, etc.
How to make this page behave well in SEO perspective?
How to make Google understand that
More...leads to more links?
How to make Google understand that the lower the link is in the list, the more likely it's spam?