ID number or URI title as identifier for content postings

Sites or apps that use URI/URL as the unique identifier for content pages
example http://somesite.com/this-is-a-test-post

• Ghost blog app
• gigaom.com which also includes date in URL /2014/04/24/
• recode.

Sites or apps that use an all-numeric ID number as the identifier along with or maybe not the friendly URL of the title
example http://somesite.com/12345
or http://somesite.com/12345/this-is-a-test-post

• qz.com - uses Wordpress VIP