Interestingly, the average sharing in the simulated distant cousins was consistently less than the observed average sharing in each population sample. This finding indicates the presence of fine-scale population structure for many ethnic groups, such as the Ashkenazim, within the last 10 generations (200-300 years).
23andMe announces "Relative Finder" at TEDMED
23andMe say they have 30,000+ "active" genomes in their database and will launch Relative Finder "soon". The beta version of Relative Finder has been available for about a week. One interesting note: while Northwestern European American users typically have on the order of 200 "cousins" listed in Relative Finder, Ashkenazi Jewish users usually have over 1,000. From a related abstract: