Pinterest forecast second-quarter revenue above analysts' estimates on Monday, helped by steady spending from advertisers as the ‌image-sharing platform sharpens its ad offerings with deeper artificial intelligence ‌integration. Shares of the California-based company jumped 16% in extended trading. The company has been stepping ​up investments in AI, rolling out enhancements to its Performance+ ad suite to automate ad creation and improve personalized targeting, which have started to bear fruit.