How is this girl setting her privacy settings on facebook ( October 2011)?

[xstalkrx]

I broke up with my gf. I am suspicious she is seeing someone else now.

When I view her facebook with my username, I CANNOT see the posts that this one guy is posting to her wall. However, when my other friend views her page, he CAN see the posts the other guy is posting on her wall. Posts like "Had a great day with you yesterday". It's obvious they are seeing each other and she doesn't want me to know about it so I won't think she is a liar when she tells me they are just friends and that she isn't interested in him.

How is she doing this? I can't figure it out when I look through my privacy settings. Certain posts made by her girlfriends are also not viewable by me.