Honestly, probably just a little bit. It's not that complex of an algorithm. The really complex stuff is MapReduce.
Can we just agree that there is quite a bit of Google code that is unlikely to ever be open-sourced? =)
Reddit's open source code excludes the crown jewels of anti-cheating/spam protection. It's their IP.
Seems more likely that it's just that they don't want spammers and cheaters to know what their defenses are.
Whoever voted that down has never looked at PageRank seriously. You can implement it in a few hundred lines of code using Page's paper from when he was at Stanford.
PageRank-Stanford-version might not be much code, but as I understand it, that's almost irrelevant to current search results which are much more complex.
Certainly. I suppose it depends on whether you see PageRank as a specific algorithm (as I think most people reading papers on search algorithms do) or "the thing that powers Google's search results". My point was that the original comment wasn't just stupid.