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I learned so much in the year after Flickr was acquired. People forget, but Flickr launched in February 2004. And a year later, the deal was done with Yahoo, and we closed it in March of 2005. It was really independent for a relatively short period of time.

People love photos. Photos originally weren't that big a part of the idea for Facebook, but we just found that people really like them, so we built out this functionality.

People want to share photos with only their friends and loved ones.

What's been important with Flickr is the community that's been there from the beginning and the serious photographers that are there creating and sharing great content. If we lose that at some point then I think we have potential issues, but so far we've been able to do a really good job of maintaining that.

About 80 percent of the photos on Flickr are public and searchable by everyone. In one sense, it's a place where people upload snapshots from the family reunion, wedding or the birth of a baby or something like that, but it's also a place where people go to show what the world looks like to them.

People want to share their photos publicly with lots of people.

I believe photos is one of the underlying things in every social network that becomes successful.

We could not have launched Causes without Facebook Platform, providing real identity and real friends. Facebook Platform was created so that experiences that are inherently social in our off-line lives could be brought online as an authentic expression of who we are; Facebook did this best in revolutionizing photo sharing.

I left Facebook after Facebook groups began appearing about me and suddenly your personal photographs start becoming public property.