Facebook shares plummet after the social network’s CFO makes it clear that revenue is going down in 2018. Troy Springer and Maria Gallagher analyze the damage, as well as Spotify’s 2nd-quarter results. Plus, they share why General Mills and Stitch Fix are on their radar. Thanks to LinkedIn for supporting The Motley Fool.  Go to https://www.linkedin.com/fool and get $50 off your first job post.