Dropbox has admitted that spam reported by its users over the last few weeks was the direct result of a security breach. Both login names and passwords were stolen from an unnamed number of users, including a Dropbox employee. That account contained a list of clients' email addresses, which is what the company believes led to the spam in the first place. In response, it has contacted those affected to protect their accounts and outlined several new security features. These include a two-factor authentication option coming in several weeks and a ne