E-Mail and Social Media
A recent survey carried out by Proofpoint, which included responses from over 220 employees of 1000 companies, shows that e-mail security is a top concern. One of the major reasons is because of the cost of e-discovery, which is happening with increasing frequency. Social Media also raises similar concerns, and there are several reports in the survey about misuse of social media, such as Facebook and Youtube.
Companies are addressing these concerns in part by issuing new corporate policies regarding employee use of email and social media. there are also reports that they are cracking down on compliance by firing those who violate the policies.
An article discussing these findings can be found on this site, which also points to a study on e-discovery.