Percolate is a system of Python scripts and modules for working with bot-updated templates, built by WMF's grantmaking department, but reusable.

https://meta.wikimedia.org/wiki/Grantmaking_and_Programs/Learning_%26_Evalua...

"Percolate provides a relatively simple and robust way of replicating some of the functionality that closed-source social software (like Facebook and Quora) use to surface relevant content and recent activity without sacrificing the flexibility that makes MediaWiki great. It does this through profiles and views..."

(found via the monthly report: https://meta.wikimedia.org/wiki/Wikimedia_Foundation_Report,_July_2013#Indiv... )