Well I leave mine that way so only people I follow can see any details which there aren't many a detail right now I might add. It's not that I'm not social I just prefer to quality over quantity and mostly I don't just want to throw someone in the list until I attach a modus operandi to the name and avatar. Your in the list now btw
I am able to delete my comment from other peeps profiles, I can clean up my own profile wall, but I cannot delete others comments from their wall. So overall you can delete from your own wall which I assume it should be like that.