Anyone else think the title is a bit too linkbaity? Only the Sith deal in absolutes...
("Never log into a Google account on a friend's machine", in case it gets changed later.)
("Never log into a Google account on a friend's machine", in case it gets changed later.)
("Use Incognito Mode when using a friend's machine or risk having your accounts stuck together"? Or maybe "Don't log into a Google account on a friend's machine without using Incognito"? It's a bit too late for me to edit, unfortunately.)