"There’s a plane in the Hudson. I’m on the ferry going to pick up the people."

Those words, hastily typed on Janis Krums’ iPhone just after US Airways flight 1549 crashed into the Hudson River on Thursday, marked yet another milestone in the microblogging revolution. Krums, a Sarasota, Fla., entrepreneur, posted his observations and a compelling photo of a half-submerged aircraft to Twitter, where it was seen by hundreds of people before any other media organization knew about the accident.

Twitter and related sites such as BrightKite have been breaking news since they’ve been around. They’ve offered first-hand accounts of events such as the terrorist attacks in Mumbai, the Virginia Tech shootings and California’s wildfires.

Before Krums scooped the New York media on the biggest news story of the year so far, there was Mike Wilson, aka "2drinksbehind", who twittered his observations after his Continental Airlines flight slid off the runway and burst into flames in Denver last month.