For those readers who ask me what they can do to help fight poverty, one option is to sit down at your computer and become a microfinancier.

That’s what I did recently. From my laptop in New York, I lent $25 each to the owner of a TV repair shop in Afghanistan, a baker in Afghanistan, and a single mother running a clothing shop in the Dominican Republic. I did this through www.kiva.org, a Web site that provides information about entrepreneurs in poor countries — their photos, loan proposals and credit history — and allows people to make direct loans to them.