This article was originally posted on Inc.com.

In remarks at Inc.’s annual GrowCo conference on Wednesday, the entrepreneur, investor, and Internet advocate divulged the most valuable lessons he’s learned since he launched the hugely popular website in 2005.

After many years away, Alexis Ohanian, the serial entrepreneur, investor, and open-Internet advocate, recently returned to the helm of Reddit, the huge user-curated news site, along with his co-founder and college roommate, Steve Huffman.

The two founded Reddit in 2005, sold it to Conde Nast a year later, spent several years working on other ventures–and, in Ohanian’s case, doing a lot of Internet advocacy in Washington, D.C.–before coming back to lead Reddit. Ohanian returned in November 2014 as chairman, and Huffman eight months later as CEO.

But they did so amidst big challenges. There was broad acknowledgment at the time that Reddit needed to clean up spammy or distasteful content. The site is now far more sprawling than when they left, with 230 million monthly active users who click on 8 billion pages per month.