NIS 2011 Scans "Facebook"?

Hi,

 

I just found out that the NIS 2011 can SCAN FACEBOOK.

 

But I'm not sure If I should so that since during the setup of the settings, MESSAGES KEEP SHOWING HOW NORTON WILL ACCESS/USE MY FACEBOOK INFO.

 

So, is it save to add Norton to my Facebook? Should I allow or deny the access. and btw, what does Norton Scan From Facebook do?

 

Thanks.

 

Ed