When I edit something, either my post or someone else's, it doesn't really make sense to me why adding paragraphs and spaces would be editing. I mean, it is editing the post, but it doesn't really show up in the edit history and it clogs up the activity page for just a formatting error. If this can't be changed I get it, I just wanted to suggest this :P
Oh, and, for example, this. It really only pushes things farther down the activity list.