Nightline shows site run by Rainn Wilson of The Office using Basecamp
productblogarchive.37signals.com/products/2009/10/nightline-shows-site-run-by-rainn-wilson-of-the-office-uses-basecamp.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Rainn Wilson of "The Office" runs a philosophy/spirituality site called Soul Pancake. Nightline profiled Wilson and the site the other night. The bottom screengrab below shows the Soul Pancake team using Basecamp to manage the site.