Hi I am starting a new directory and I was wondering is it against the TOS if I place adsense on the website, as some of my categories will not have links(yet)? I have seen some directories that have ads but I am not sure its allowed!
If your categories don't have any links, then the Adsense spider won't have much to go by to determine the content of the page. Just make sure you have no empty categories before you put the Adsense up. For most directories, Adsense is not a good way to make money anyway. So you won't exactly be losing out on a large wad of cash by holding back until you actually have some content.