OpenStreetMap contributors weren't happy about the quality of tags when the import started: https://forum.openstreetmap.org/viewtopic.php?id=63456

Facebook wasn't the only company adding low-quality data: https://forum.openstreetmap.org/viewtopic.php?id=64430 (Previous discussion on HN: https://news.ycombinator.com/item?id=18723138 )

This article's quotes of what appear to be OpenStreetMap representatives are generally positive, so maybe that means they fixed all the problems they caused.