It’s micro-messaging meets micro-funding. Marketing consultant Laura Fitton is trying to raise money $2 at a time through Twitter. She is using Tipjoy, which allows people to turn Tweets into payments (via PayPal). Help her raise $25,000 for Charity:Water by Christmas. Tipjoy investor John Borthwick has agreed to match up to $10,000 in donations.

For less than the price of a double latte, you can give clean drinking water to children in villages across the world. All you need to do is enter your Twitter ID in the widget at this link, and then fund a TipJoy account. You can give $5 to the Salvation Army or the Google Lunar X-Prize through TipJoy instead.

And you thought Tweets were worthless.