This article is from March 2012. It has been posted twice before to HN to little impact. http://hn.algolia.com/#!/story/forever/prefix/0/Whatsapp%20scaling ht

This article is from March 2012. It has been posted twice before to HN to little impact. http://hn.algolia.com/#!/story/forever/prefix/0/Whatsapp%20scaling http://hn.algolia.com/#!/story/forever/prefix/0/Whatsapp%20s... (Correction: the presentation is from 2012; I don't know when it was posted online.)