Here, they not only provide a sample letter, but also explain to you why each portion of the letter is important and impactful, from the beginning greeting to your closing statements and signature.
The freedom of speech argument rings a little hollow in a medium in which the most impactful statement seems to be, "Have fun!"
By giving away your old car instead of reselling it, you will be helping many impactful organizations that cannot make a difference without such acts of generosity.
While it took many years, the ballet world did eventually acknowledge Modern dance through the stylings of an impactful choreographer named George Balanchine.