Did other similar companies experience equivalent decline during this period? Did those top advertisers reduce their spending elsewhere as well? How many of t

Did other similar companies experience equivalent decline during this period? Did those top advertisers reduce their spending elsewhere as well? How many of them have publicly stated their reasons? How much of the total ad revenue comes from the top 1000 advertisers? Once we get answers to those questions, we can start making conclusions about the causes and the impact beyond simple speculation.