Once your site is becoming more and more popular you as the site Admin will have to make more and more efforts to keep the order between your visitors. Here is the colorful scheme for users approve.
White colored field will always appear in the top of the list as these are unchecked visitors.
Once you trust the user and approve him - the background color will change to green.
If you already checked the user but not sure if he is reliable or not you can mark him to know that another checking needed. In this case the color will be red. And these category will appear right after non checked users.
