For example this nice URL “/spidersapien/” (in bold)

gets replaced with a less clickable “Toys & Games > Robots”

On the plus side the categories in the hierarchy are links through to the category pages on the site but this isn’t clear when you look at them which could lead to confusion.

Here is how the links are generated:

The information in these new hierarchies come from analyzing destination web pages. For example, if you visit the ProductWiki Spidersapien page, you’ll see a series of similar links at the top, “Home> Toys & Games> Robots.” These are standard navigational tools used throughout the web called “breadcrumbs,” which webmasters frequently show on their sites to help users navigate. By analyzing site breadcrumbs, we’ve been able to improve the search snippet for a small percentage of search results, and we hope to expand in the future.