I like this; if you do it right, it could do an enormous amount of good. That said, I think you should be choosy about which charities you promote; rather than

I like this; if you do it right, it could do an enormous amount of good. That said, I think you should be choosy about which charities you promote; rather than let charities seek you out, you should seek out the very best charities and promote them exclusively. The amount of good-per-dollar varies by multiple orders of magnitude, so the difference in impact between promoting only the best charities and promoting average charities can be enormous. I would suggest directing people to GiveWell's (http://givewell.org http://givewell.org) top charities list, or to one of the specific charities on it.