http://en.wikipedia.org/wiki/Genetic_drift http://en.wikipedia.org/wiki/Genetic_drift Maybe in a small population social news site, the 'norm' for content can

http://en.wikipedia.org/wiki/Genetic_drift http://en.wikipedia.org/wiki/Genetic_drift Maybe in a small population social news site, the 'norm' for content can drift in a similar fashion to allele frequency in a small gene pool.