Norton Safe Web is an url scanning service offered by Norton. It scans websites and urls and displays possible threats found on those websites to users of the service. It is in this regard similar to other url scanning services like AVG Linkscanner or Web of Trust.
Norton Safe Web For Facebook is a Facebook application that uses the safe web database to scan a Facebook user’s feed. The main benefit for the user is that the it will scan the feed regardless of the computer the user is accessing Facebook with.
There is obviously no real advantage for Facebook users who access the social networking site from the same computer where they have proper security software and browser add-ons installed that warn about malicious links.
The application will automatically scan the user’s feed once it has been added to the list of installed apps on Facebook.

The report lists the number of links that has been checked in total as well as the amount of safe links, warnings and untested links. Users with no posts in the last few hours will only see zeros in the scan results. This is a bug according to Norton that will be fixed soon.
Norton is not providing many information about the application itself, especially when and how links are scanned. It is nevertheless interesting to see that security applications are finally starting to appear on Facebook even though this smells a lot like a clever marketing ploy to promote the Norton 2011 security software lineup of which Norton Safe Web is a part of.
Still, if you want to give it a try visit the Facebook application page of Norton Safe Web for Facebook to do so.
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Not sure if you really need to use it when Prev Safe Online for FaceBook users is pretty much offering good service.
Symantec and Mcaffe both have ways to go to before they become a proper provider of security.
BTW,I am not on FaceBook!Malicious ads,rouge anti-viruses,1.5 million hacked accounts,I had enough even before I could join FB.
PS Social engineering sites always under the watchful eyes of maliciousness.