Oil companies are hiring TikTok influencers to court young people. The TikTok star Nora Capistrano Sangalang is best known for posting videos about her grandson, in which she describes herself as “our Filipino grandma” and a “granfluencer.” But in September, she posted something that surprised and irritated some of her 2.3 million followers across TikTok and Instagram: an advertisement for the oil...