《经济学人》：线上数字广告大变革？
原文标题：
DigitaladvertisingOh,snapTheonline-adindustryisinthemidstofanunprecedentedshake-upAyears-longbonanzaisgivingwaytomoreuncertaintimes[Paragraph1]Fordigital-adsellers,wasalwaysgoingtobeahardacttofollow.Aswork,playandshoppingshiftedonlineduringthecovid-19pandemic,internetadvertisingboomed.InAmericaspendingroseby38%,to$bn,
