Karp saw the potential for Tumblr after noticing how cutting-edge programmers interacted online; they called it tumblelogging. “They were blogging without sitting down to editorialize on their day for 20 minutes. Instead, any neat photo they came across or took, every cool link they found, anything they created just sort of went up. I loved the idea of having a blog, but I wasn’t wordy enough. I wanted an identity online.”

Tumblr’s version of the Digital You looks like a Flickr stream, a condensed Blogger roll and a collection of del.icio.us links all in one. As Tumblr’s website puts it: “If blogs are journals, tumblelogs are scrapbooks.” In other words, a tumblelog can contain, really, anything you want—it’s a vertical cascade of words, pictures, quotes, audio clips and video snippets.

Of course, WordPress and Blogger also support a variety of content, but what sets Tumblr apart is the ease of uploading. The minimal dashboard contains buttons simply labeled TEXT and LINK, which immediately add content to your tumblelog. The site even takes care of technical things like sizing photos, formatting paragraphs and embedding videos. By streamlining the process—the site also supports uploading from your cell phone and via instant messenger—you’re hard-pressed not to find good content to share.

Like MySpace or Facebook, Tumblr provides a sense of community: You’re able to “follow” tumblelogs you find interesting, meaning their posts appear on your dashboard screen in the order they show up online. Karp likens this to looking through the eyes of others, as opposed to stalking them like on Facebook or Twitter. Like what you see? “Reblog” friends’ content on your own site with a single click. And unlike WordPress, Tumblr doesn’t categorize users as music bloggers or humor bloggers—people are just people. Plus, Tumblr’s interface—unlike that of its social-networking predecessors—is clean, controlled and, best of all, ad-free.

Come to think of it, Tumblr doesn’t seem to make any money at all. It gives away even advanced features: The grand site launch included support for custom HTML themes and the ability to use your own domain name—all things you have to shell out additional money for on other sites. Karp says his group—which consists of himself and three others—plans to roll out yet-to-be-identified “alternative ways to publish content” for paying power-users.Given the tools Tumblr provides and its smooth handling, the site may be the best one out there to create an online you—as the site says, “Everything you find, love, hate or create.” Karp says Tumblr’s users have been pleased with the results, and they’re showing it in ways you’d expect from a generation familiar with MySpace’s Tom. “People are trying to maintain a relationship with us—like at Apple, how people are terribly curious about Steve Jobs.” Maybe they should just read Karp’s Tumblr page.

Start tumbling at tumblr.com.