Pinterest reports Q3 revenue up 12% YoY to $1.17B, vs. $1.21B est., global MAUs up 10% to 661M, and forecasts Q4 revenue below est.; PINS drops 8%+ after hours (Liz Moyer/Barron's Online)

Liz Moyer / Barron's Online: Pinterest reports Q3 revenue up 12% YoY to $1.17B, vs. $1.21B est., global MAUs up 10% to 661M, and forecasts Q4 revenue below est.; PINS drops 8%+ after hours — Choose Barron's as a preferred source of financial news — Key Points — Pinterest missed expectations and…