"...people's friends may not only have similar traits, but actually resemble each other on a genotypic level."
Cool study on relationships between behavior, personality, and genetics in humans.
Correlated genotypes in friendship networks; PNAS 2011
A collection of links (vaguely) relevant to molecular anthropology, primatology, and bioanth in general. Feel free to post any bits and bobs of potential interest or amusement.