There have been several reports of unwanted advertising pop-ups with doubtful site urls being spread via "malvertising" in the free version of Spotify. "Spotify's ads crossed from nuisance over to outright nasty this week, after the music service’s advertising started serving up malware to users on Wednesday. The malware was able to automatically launch browser tabs on Windows and Mac PCs, according to complaints that surfaced online. As is typical for this kind of mal...