Google Analytics
Used by 10 peoplemarketingplatform.google.com ↗

“Some days I feel like I am knee-deep in Google Analytics for the site.”
Morgan Holzer Interview, Information architect (NYPL) · via Uses This 
“Google Analytics and live searches on twitter are invaluable in figuring out how readers engage my blog, and how to tailor my content to their needs.”
Matt Might Interview, CS Professor (University of Utah) · via Uses This