Jeff Bezos famously banned PowerPoints from executive meetings at Amazon.Getty/Gareth CattermoleDropbox has taken a page from Amazon's book when it comes to meetings.The company uses memos in meetings, which begin with attendees reading them and leaving comments.Amazon's Jeff Bezos famously banned PowerPoints in exec meetings, instead asking for 6-page memos.Jeff Bezos' rules for meetings at Amazon have made their way to Dropbox.Dropbox CEO Drew Houston said his company has adopted the "memo-first" meeting culture.