Pinterest (NYSE:PINS) stock is in the green today despite the release of a short report from Grizzly Research. The research firm’s model values PINS stock between $5.28 and$16.First, Grizzly points out that Pinterest uses monthly active users (MAUs) as a key performance indicator (KPI) in order to “deliberately conceal the decline in user engagement and value.” That differs from other related companies who report the more granular daily active users (DAUs) and impressions or clicks per user. The firm added ...