(Reuters) -Alphabet shares jumped about 3% on Friday, after a solid earnings report from the Google parent showed investors that its bold bets on AI were fueling growth in the core advertising business, soothing some concerns around competition and tariff-related pressures. Google's advertising revenue rose a better-than-expected 8.5% in the first quarter, in a welcome respite to investors who were worried that a decline in U.S. ad spending amid global trade tensions could significantly dent the digital ad market. Industry data from early April that showed a sharp pullback in U.S. digital ad spending from Temu and Shein - the biggest advertisers on Google Search in the U.S. - further fanned fears.