When building content aggregations with users’ information Content Search Web Part publishes account names in page source.
When building content aggregations for catalog content in cross-site publishing scenarios Content Search Web Part includes the original URL of the catalog item in the page source.
When working with Managed Navigation check the ‘Hide physical URLs from search’ checkbox for all pages.
If you are using Friendly URLs in your website you must use Content Search Web Part to build content aggregations.
When having an idea for a companion app for your SharePoint 2013 website you can explain it to your boss or your customer on a napkin or you can quickly compose a prototype using Microsoft Project Siena.