<quote name="Cindy Cicalese" date="2018-03-07" time="22:12:36 -0500">
Aggregate pingback data collected since March 2017 is now viewable at https://pingback.wmflabs.org in graphical and tabular form. While this data only includes sites that opted in to data collection, it shows over 40,000 unique installations of MediaWiki in the last year in a variety of different configurations.
I've said it before but: this is great Cindy!
Thank you!