This weekend marks four years since we began publishing, and we hope you'll take just a moment to mark the occasion. Please consider a donation so that we can continue providing the kind of investigative journalism in the public interest which we know you value.

It's been quite a ride:

• Four years ago, lots of people were skeptical we could find news organizations willing to join us in publishing our best stories. Today, we've had more than 90 partners, including nearly every leading news organization in America.
• Four years ago, we were unknown and unheralded. Today, our work has been recognized by our peers, earning the first Pulitzer Prize for an online news organization and the first for stories that appeared only online. ProPublica's reporting also was honored with three George Polk Awards, a National Magazine Award and three Emmy nominations. Our work was a finalist in each of the past four years for Harvard's Goldsmith Award. This week, three of our reporters won a Livingston Award for Young Journalists.
• Along the way, our work has had real impact. We've led in revealing the dangers of unfettered hydraulic fracturing of natural gas, and prompted reforms in policing in New Orleans, nursing in California, regulation of collateralized debt obligations, recognition for our brain-injured troops, disclosure and limitation of pharma company payments to doctors, and greater transparency on the quality of dialysis facilities.
• Four years ago we had a news staff of 20; now we're 34 and growing. In June 2008, our website had 77,000 visitors; last month we had more than half a million. We had 58 Twitter followers by the end of our first month; today we have nearly 130,000.

All of this — and everything we're planning for the months and years ahead — requires support. In 2008, nearly all of that funding came from one source, but last year more than half came from others — and more than 2,600 donors contributed. If you've been one of them, thank you again. Please help us mark this milestone. Donate today by clicking here.

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