Some of the best companies around are still private: Evernote, SpaceX, Twitter, and, of course, Dropbox, the file-sharing service that's ostensibly surrounded by Google's (NASDAQ:GOOGL) Drive, Microsoft's (NASDAQ:MSFT) SkyDrive, and Apple's (NASDAQ:AAPL) iCloud.

More than anything else, the flexibility to handle work as well as personal files deftly has made Dropbox popular. What we didn't know is just how popular. But then Strategy Analytics released a report that found it to be the second-most-popular "locker" for digital music and movies, trailing only iCloud.

Is now the time for Dropbox to go public? Tim Beyers of Motley Fool Rule Breakers and Motley Fool Supernova answers this question and more in the following video. Please watch, and then weigh in using the comments box below.