Can you please indicate exactly when the change from contextual to behavioral targeting was made and when it was communicated to existing advertisers? For examp

Can you please indicate exactly when the change from contextual to behavioral targeting was made and when it was communicated to existing advertisers? For example, in the initial announcement post (Mar 30) there is no indication that changes to the targeting methodology had been made already: https://www.reddit.com/r/changelog/comments/62fake/weve_launched_a_completely_revamped_selfserve_ads/ https://www.reddit.com/r/changelog/comments/62fake/weve_laun...