K E T I N G U P D A T E 2 The Effect of Optimization Optimization began on 6/17 Optimization drove the Suggested Videos growth rate by an additional 5.3% (2.2 million more views) after taking effect, compared with the period immediately before 6/17. The growth rate of YouTube Search, another key indicator, increased by 2.6% before and after. 32,963,812 39,063,986 0 5 10 15 20 25 30 35 40 45 6/17/15 8/1/15 Views (Millions) Date (45-day Period) Cumulative Suggested Videos Views, 2015 18.9% 13.9% 28,802,730 32,721,696 0 5 10 15 20 25 30 35 40 45 5/3/15 6/16/15 Views (Millions) Date (45-day Period) Cumulative Suggested Videos Views, 2015 13.6%