Thanks for sharing! These all look very interesting.

Quick question: how did Yahoo monetize Flickr?

Quick answer: They didnt, instead they destroyed the product and the founders left (along with the rest of the talent attached to the product) in 2008

Quick answer: Freemium +

Quick rebuttal: Flickr barely makes any money.

and the freemium model was in place before Yahoo bought them

I was a pro user, cancelled when Yahoo bought Flickr and forced us all to use Yahoo accounts.

I did completely the opposite. I like what Yahoo have done with Flickr.

There are several sources that suggest Flickr revenues have been in excess of $100M per year for several years, possibly much more.