General elections were held in Brazil on 1 October 2006 to elect all seats in the Chamber of Deputies, one-third of the Federal Senate, and members of the Legislative Assemblies of the 26 states and the Federal District. As no candidate for president received over 50% of the vote, a second round run-off was held on 29 October between incumbent Luiz Inácio Lula da Silva and his challenger, Geraldo Alckmin. A second round was also required in 10 states where no candidate for governor received a majority. Lula won the second round with over 60% of the valid votes and secured a new four-year term.
Netflix developed and maintains an extensive personalized video-recommendation system based on ratings and reviews by its customers. On October 1, 2006, Netflix offered a $1,000,000 prize to the first developer of a video-recommendation algorithm that could beat its existing algorithm Cinematch, at predicting customer ratings by more than 10%.