Lauren Feiner / CNBC: Pinterest reports Q1 2019 revenue of $202M, up 54% YoY, net loss of 41.4M, down 21% YoY, global MAUs were up 22% YoY to 291M; stock down ~19% after hours  —  KEY POINTS  — Pinterest shares fell as much as 17% after the company released its first quarter 2019 earnings report after the bell on Thursday …