In case you missed it, or want to share it with friends and colleagues, here's digital ethnographer danah boyd's talk about race, class, and the disturbing signs of "digital white flight" among Americans online. She takes a close look at how young people seem to be self-segregating between Facebook and MySpace, and challenges to audience to look hard at how online social networks may be reproducing or intensifying social divisions in America.

The text of danah's talk is up on her blog. Needless to say, it has generated a huge amount of intense discussion.