Quick Answer: No
Let's suppose that you are a big believer in the efforts of the American Red Cross. To show your support you you advertise that for every Buyer or Seller that you assist in a transaction you will cut a check to the American Red Cross. For all intents and purposes this seems like a great thing, right?
Unfortunately, this is NOT allowed. In this example the American Red Cross is a third party that is not a party to this transaction. They didn't provide you with the lead so you can't even give them a finders fee, this is not an inducement gift as those are only allowed for the Buyer/Seller, so any advertised gift to a third party would be an illegal sharing of the commission, even if it's for a good cause.