Facebook and Twitter: Congratulations to everyone who helped English-language Wikipedia reach 5 million articles! (with sign Joe made and Link).
It's short, happy, and contains "congratulations," which is a trigger word http://www.wired.com/2014/04/perfect-facebook-feed for the Facebook algorithm.
Jeff Elder Digital communications manager Wikimedia Foundation 704-650-4130 @jeffelder https://twitter.com/JeffElder @wikipedia https://twitter.com/wikipedia The Wikimedia blog https://blog.wikimedia.org/