Another issue: Defensio's default profanity feature isn't enabled by, well, default. I had to turn it on manually. Before I did so, the app didn't alert me to any profanity at all. Once the default feature was enabled, the app proved fairly adept at picking up suspect profanity, catching most of the swears sent my way, with no false positives. Unfortunately, though, it missed several posts, including some with the same curse words it had previously identified. Results with porn links were similarly mixed: It failed to notify me of one link to a porn site that had been posted to my wall, even though the link's description contained the phrase "naked girls." It did, however, flag a posted link to a more well-known porn site with a more obvious name.
When Defensio does catch posts containing suspected profanity, spam, or malicious content, they're listed in its "Comment Moderation" section. You're given two options: "Delete" or "Not Spam." Opting for "Not Spam" simply removes the comment from Defensio's list. And while you might think that selecting "Delete" would delete the post, you'd be wrong. Instead, it generates a pop-up message telling you that due to Facebook limitations, you must manually delete the post.
Defensio's approach would make sense if the Comment Moderation section acted as a queue for holding suspect posts, which you could then delete or approve for posting. I understand that the app is hamstrung by some of Facebook's rules, which is unfortunate. But its limitations would be less frustrating if the software's interface made them clearer.
Websense, the company behind Defensio, says that these limitations only apply to personal profiles, not Facebook pages set up for companies and such. If you're a business user looking to safeguard your company's Facebook fan page, then Defensio might prove a useful companion. We did not test it on business pages profiles, and thus can't give an opinion on that service. And if you're looking for guidance on which Facebook posts might contain suspect content, Defensio might point them out. But if you're simply looking to keep your Facebook profile squeaky clean for any and all prying eyes, well, Defensio for Facebook doesn't really do anything you couldn't do on your own.