What this amounts to is a highly layered security strategy consisting of vital elements that include intrusion prevention, botnet and application control, Web filtering, antispam, and antivirus.
With a majority of retailers today using social media to offer promotions or coupons, a solid Application Control and URL Filtering solution can help mitigate the risks employees may encounter with millions of websites and Web 2.0 applications accessible to users.
The truly paranoid may elect to use the 2.4 kernels' Netfilter4 facility (adding stateful packet filtering) or a commercial application-level proxy gateway.