<i>We depend in part on internet search engines, such as Bing, Google, Yahoo! and Yandex, to direct a significant amount of traffic to our service. For example, when a user types a query into a search engine, we may receive traffic and acquire new users when those search results include Pins, boards, Pinners and other features of our service that cause the user to click on the Pinterest result or create a Pinterest account. These actions increase Pinner growth due to signups of new users and increase retention and engagement of existing Pinners.<p>Our ability to maintain and increase the number of visitors directed to our service from search engines is not within our control. Search engines, such as Google, may modify their search algorithms and policies or enforce those policies in ways that are detrimental to us, that we are not able to predict or without prior notice. When that occurs, we expect to experience declines or de-indexing in the organic search ranking of certain Pinterest search results, leading to a decrease in traffic to our service, new user signups and existing user retention and engagement. We have experienced declines in traffic and user growth as a result of these changes in the past, and anticipate fluctuations as a result of such actions in the future. For example, in the first quarter of 2018, Google de-indexed our keyword landing pages, which negatively impacted traffic and user growth in the quarters that followed. Our ability to appeal these actions is limited, and we may not be able to revise our search engine optimization (“SEO”) strategies to recover the loss in traffic or user growth resulting from such actions. Changes in policies or their enforcement may not apply in the same manner to our competitors, or our competitors’ SEO strategies may be more successful than ours.</i><p>Seems like a horrible business to invest in when you're so utterly at the whim of someone else you have no control over.