Over 68 million Dropbox user names and passwords have been posted online, four years after the file-sharing service was breached. Hackers can use URL information to find other files theyve publicly shared and may have forgotten about. Changing passwords regularly and enabling two-factor authentication are some of the best practices users can carry out themselves to boost account security. Users should also be cautious about the data they share in Dropbox public folders as hackers can use URLs to find files they’ve publicly shared.”]