Anthony Ha, “Dropbox CEO: Why Search Advertising Failed Us,” October 27, 2010, http://venturebeat.com/2010/10/27/dropbox-drew-houston-adwords/; Drew Houston, “Dropbox Startup Lessons Learned,” posted April 24, 2010, http://www.slideshare.net/gueste94e4c/dropbox-startup-lessons-learned-3836587.