Tagging as it is used at some of the Web’s most interesting and lively new sites is launching a revolution of self-organization on the Internet. You could call it the latest twist in the ongoing evolution of social networking software. Except there’s a difference: On social networking sites like Friendster, people join, and then declare their alliances to each other explicitly. On sites that employ tagging, the networks emerge, implicitly, out of the shared interests of users. Order isn’t proclaimed, it just happens.

What 43 Things does for personal goals, the bookmark-sharing site del.icio.us does for everything its users are interested in on the Net. Here, what people are looking at and saving from the Web becomes the basis for learning new things, and making connections with each other. “It’s like Friendster for knowledge as far as I’m concerned,” says Howard Rheingold. “I look to see who the other people are on del.icio.us who tag the same things that I think are important. Then, I can look and see what else they’ve tagged… And isn’t that part of the collective intelligence of the Web? You meet people who find things that you find interesting and useful - and that multiplies your ability to find things that are interesting and useful, and other people feed off of you. Visit 43things.com …