Looking through the notifications settings for my account, I noticed that I only have the option to turn on/off all of my wall post notifications. There's a sizable group of people who would like this to be changed so that wall post shares, likes, comments, and replies can be four separate options. Sometimes, people might require getting notified about someone commenting or sharing a post rather than getting separate notifications for people liking the post as it may not be something they're looking forward to. Submissions and forums have the option to prevent getting notified, so wall posts should as it's one of the most common posts people create.