What's the Ideal Coffee to Water Ratio for a French Press?

What's the Ideal Coffee to Water Ratio for a French Press?

What's the ideal amount of coffee to use per cup of water in a French press?
I've looked at various online resources, which all gave me a different
amount. Some call for 2 tablespoons per 6 oz of water, others per 4 oz.
Others said to use one or the other, and add water after brewing if it's
too strong.
So what's the ideal blend for extracting the best flavor?