The title of this thread bugs me because "legal" has nothing to do with anything at all.

Did the PR chair set this rule down on her own or was it agreed on by all NPC sororities?

You have three choices:

a) Keep your Facebook profile as is, but remove any kind of affiliation from the profile.

b) Comply with what your PHC says

or

c) Don't give a shit, keep your profile as is, because really...who the hell is she to tell you what to do, right?

I'm so glad we didn't have FaceBook or MySpace when I was in college. I'd be all about c.