I'm a huge fan of dark chocolate! But how much is to much?

I've found the following bar. It's a fairtrade, carbon neutral product and comes from Switzerland

The nutritional values (100grams)

78% dark chocolate
7 grams protein
48 grams fat
41 grams of carbs

I could eat 100grams a day (who couldn't), but is that overdoing it?

I'm on around 50 carbs a day, from fruits and veggies btw