I think Maciej worked at Delicious, which then got acquired by Yahoo. He then created Pinboard as a Delicious competitor, while Yahoo ran Delicious into the gro

I think Maciej worked at Delicious, which then got acquired by Yahoo. He then created Pinboard as a Delicious competitor, while Yahoo ran Delicious into the ground (as he predicted). Then when Delicious users had flocked to Pinboard, he acquired Delicious from Yahoo.