More and people are looking to services like Dropbox as a way to quickly share documents. But there are dangers. Beware of security dangers!
“An example of such an exploit came to light this month, owing to a Dropbox employee having stored an unencrypted document on the service that contained Dropbox users’ email addresses. An attacker logged into the Dropbox employee’s account, using a password that the employee had reused on another–compromised–site, obtained a copy of the document, then used the email addresses to unleash a flood of spam at Dropbox users.”
This Information Week article spells it out.