How much dark chocolate should be in a serving size to get any benefit?

pat asked: I found this website, but I can’t figure out the “serving size” that they recommend :
http://www.allchocolate.com/health/nutrition/antioxidants.aspx
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Technorati Tags: Benefit, Dark Chocolate, Health Nutrition, Serving Size

Is this a healthy dark chocolate?

Centar E asked: I ate 100 grams of Swiss Delise Classique Extra Fine Dark Chocolate. Its ingredients are cocoa mass, sugar, cocoa butter, emulsifier: soya lecithin, flavour. It has a minimum of 55% cocoa solids. It has 512 kcal, 6 grams of protein, 46 grams of carbohydrates and 34 grams of fats. Is SOYA LECITHIN [...]