Facebook Isn't So Safe Anymore

Facebook compared to MySpace has a pretty squeaky clean reputation, but when Facebook has over 150 million users to date, then security becomes a much bigger concern. This latest post on TechCrunch details a few things that allowed Facebook to get to this point, and what it needs to do to change it.
When Facebook initially launched, users needed an .edu address in order to login, but now highschool students can create Facebook accounts and even the general public. Each group still belongs to a certain network, but it is still possible to overcome these challenges. MySpace has a pair of human eyes viewing every single picture that is uploaded to the site, to make sure that nothing inappropriate gets put up. Facebook relies on its users to flag inappropriate content. This is one thing that Facebook will have to improve as the number of registered users increase by the day.
Even with rules and regulations put into place, is it possible to stop every single threat? What have businesses done to ensure that their content does not get into the wrong hands?