Mitch Kapor likes to solve problems. In the 80s, he was the guy behind Lotus 1-2-3, the first killer app for computers. More recently he decided to tackle a a simpler problem – synchronizing Firefox bookmarks across multiple computers. His popular Firefox plugin, Foxmarks, has been downloaded 700,000 times and has 350,000 active users.
All those users create some very well organized bookmark data. Unlike Del.icio.us, where people throw thousands of bookmarks for later reference, users tend to have fewer, but more important, bookmarks linked directly from their browser. And they spend more time properly annotating those bookmarks, Kapor says. So far, Foxmarks is tracking 250 million bookmarks, from 20 million unique URLs.