9. Use research to determine the percent of computers running the Linux operating system.
Most data show Microsoft at about 90%, Apple around 5%, and Linux at about
1%.
http://marketshare.hitslink.com/operating-system-market-share.aspx?qprid=10
It starts to get trickier when you have to decide how to include cell phones and
tablets.
http://blogs.chron.com/makingmovies/archives/2006/04/youtube_and_the.html