Socialgo.com: SocialGO - Create Social Network, Build Social Networking Sites, Free Social Network Maker
SocialGO allows you to build a custom social network, whether you are a beginner or a seasoned developer. No software, hosting or coding required, as our team offers full support for your social networking site.
Pluck.com: Pluck by Demand Media | Integrated Social Media Solutions
Providing syndication, blogging, user interaction and news aggregation software and services, Pluck helps its customers more easily consume and leverage the new open content model that has emerged as the cornerstone of Web 2.0.