While AI spending is top of mind, online ads are driving a lot of Big Tech's growth

META CEO Mark Zuckerberg (L) and Microsoft CEO Satya Nadella.Getty ImagesAs tech giants increase their already breathtaking spending on artificial intelligence, their respective digital advertising businesses have also gained momentum.Quarterly earnings reports this week from Meta, Amazon, Alphabet and Microsoft all showed healthy revenue on the ads front.The rising online advertising sales have allayed concerns earlier this year that economic turbulence, amplified by President Donald Trump's trade policies ...