Maile Ohye from Google posted a detailed 15 minute video on how to use URL parameters feature in Google Webmaster Tools. The feature is fairly technical, so Maile who has a gift of explaining ...

Google's Gary Illyes warns of URL parameter issues causing crawler inefficiencies, especially for e-commerce sites.

Hiding URL Parameters With a PHP Redirect. When you execute a PHP script from another PHP script and pass data using URL parameters, those parameters are visible on the address bar.

Gary Illyes warns about URL parameter issues on LinkedIn. He advises using robots.txt to manage URL parameters. This matters because it affects site crawling and indexing efficiency.