The Sin in Singleton

Arguing about Singletons is always fun. Although the name of this post suggests that Singletons are bad that’s not the message. The writer does a great job describing when Singletons are actually good and why this pattern is abused too often.
https://sandofsky.com/blog/singletons.html

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Why Singletons Are Controversial

An old post about Singletons. It describes very accurately what are the potential issue of (ab)using Singletons.
https://code.google.com/p/google-singleton-detector/wiki/WhySingletonsAreControversial