del.icio.us adds 'your network' social networking tool--did they get it from my web?

Clickable Culture (and others): Second Life has 200, 000 avatars--double 4 mos ago.
Ross Mayfield: What are the power laws of user engagement? Ross writes: "...Patterns have emerged where low threshold participation amounts to collective intelligence and high engagement provides a different form of collaborative intelligence."
NYTDigital: Vivian Schiller to manage web site (yeah, I can't resist the media news...)