What is the exact meaning of "Single" in Single responsibility principle

http://sklivvz.com/posts/i-dont-love-the-single-responsibility-principle
I don't love the single responsibility principle

Refactoring code that accesses external services by Martin Fowler

http://martinfowler.com/articles/refactoring-external-service.html

Quote from Ralph Johnson: Before software can be reusable it first has to be usable.

Reusable software is not number one priority anymore. So why want to design software to be reusable.

Procedural vs OO, Anthropomorphism Gone Wrong: Poor Motivating Example for OOP

Procedural vs OO with code example
http://loup-vaillant.fr/articles/anthropomorphism-and-oop