Pinterest shares plummeted 20% on Wednesday after lackluster third-quarter earnings as advertising took a hit from larger retailers dealing with tariffs.The company posted a profit of 38 cents per share adj., while analysts polled by LSEG expected earnings of 42 cents per share. However, the platform's revenue did meet analyst estimates of $1.05 billion."Tariff-related weakness showed up for the first time in our digital ads universe and will reinforce PINS' lack of customer diversity for the bears and high ...