Modern-day networking with Linkedin and Xing

Great post on Linkedin by Guy Kawasaki yesterday - absolute must read for anyone interested in modern networking. Linkedin is definitely a great tool and has really reached critical size here in the US over the last 12 months. As a European I also use Xing and I wish that at some point either one of them bought the other. They are essentially doing the same thing and a lot of folks are on both networks - why not join forces and become one awesome networking powerhouse - that could ultimately be worth more than Facebook b/c it enables business people to meet and work together.