When I decided which sorority to join I looked at their national platforms for the most part. I did that to determine which sorority's agenda was the closest to what I believe in.
On a side note, you do need to be a bit more discreet. Things can get a bit rough for you if you're not.
I don't know about other sororities, but my sorority, in particular my chapter, kept watch on these kinds of forums.
Good luck!