Myspace covers social networking among people well (although it is clearly youth oriented) and LinkedIn covers networking for individuals well although the site seems a bit dry to me. Seems like there is a gap in the market for a site that covers all types of networking - social and business I've seen businesses try to get set up with profiles on myspace and I have tried it myself but it is a bit wierd having to give your business a gender and fake age etc for the profile!