When classifying a diet plan as "online", we mean that all of the program's detailed information, the meal plans and recipes, and all tools and support are accessed online via that program's web site. Of course, many will also supplement the online version with hard copy printed materials such as books and magazines, and may also include phone support. But the primary means of managing the plan on a day to day basis is via their web site. Check this area for both paid and free online diet plans.
Real world diet support groups generally involve signing up with a program in which you attend meetings with people in your area, or visit a diet center near you on a recurring basis. These in-person, face to face types of plans are especially useful for those who are motivated by interacting with others directly, rather than virtually as in the online world.
We classify plans as DIY (Do It Yourself) when they only involve the dieter and some materials, such as books, etc. If you don't want any kind of social interaction, support or a strict plan, you probably will do best by winging it on your own. DIY diet plans will focus mostly on obtaining plan material from books, cds and dvds, and are often what people are seeking when searching for the top 10 diets.