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An idea I've had for a long time with regards to navigating the web is to find a way to browse it.
"Browse" a difficult word to use, because it has a newer connotation of just using a web browser, I mean it in the old pre-Internet sense, browse like when you flip through a magazine, or peruse an antiques shop, not really looking for anything in particular just sort of seeing if anything catches your eye.
Stumbleupon used to do this pretty well, although completely randomly. I wanted something with more direction.
In a previous attempt, I had an idea that you could use outgoing links to accomplish effect, but the result just wasn't particularly impressive. With the discovery (and subsequent bastardization of) the PPR algorithm, I gave it another shot.
I calculated a modified personalized pagerank for every domain in my search engine and stored it away in a database. This is about a million domains, but I excluded the periphery of the graph so in practice it was more like 150k domains that needed getting a ranking. It's easy to run this in parallel so it only took about two hours, that's manageable.
The presentation is super sketchy and not nearly finished, but the effect is so cool I wanted to share it.
A sample of origin points:
Reach me at kontakt@marginalia.nu