Facebook's growth forecast was initially underestimated; they grew to over 2 billion users by being intentional about growth strategies.

Facebook's success stemmed from our commitment to keep improving the platform based on user demand, which was different from my previous projects.

At the time of Yahoo's offer, Facebook had 10 million users, and it wasn't clear that we would succeed beyond that point, leading to intense discussions within the company about whether to sell or continue building.

In the early years at Facebook, we should have focused on iteration speed rather than building a large team and a polished product.

The growth group we established at Facebook was crucial for our rapid growth, as it focused on leveraging our product to encourage community members to evangelize it to their friends.

Facebook's success was due to secure connections and ensuring that new users had at least 20 friends on the platform, which made it more engaging.

The initial market for Facebook was just 10,000 people at Harvard, but it quickly gained a significant market share, demonstrating the potential of small markets.

The growth and user engagement on Facebook excited me, even though I wasn't a big user myself; the metrics showed it was gaining traction quickly.

After launching, we grew from reaching about a hundred thousand people a month to a million and a half a month.