So you want to do Social Computing on Microsoft platform? Well its now a no brainer. SharePoint is the tool that allows: Source
Empower Teams Through Collaborative Workspaces
Microsoft delivers a best-of-breed collaborative infrastructure that gives end users the tools to easily create their own workspaces and share assets across teams, departments, and organizations while maintaining IT control.
Connect Organizations Through Portals
Microsoft will help bring the full insight and data of the organization to the right people at the right time by making it easy to connect people with line-of-business data, experts, and business processes across the organization.
Enable Communities with Social Computing Tools
Microsoft gives organizations the tools to deliver a broad set of social computing capabilities within their existing workspace and portal infrastructure, so end users can more easily harness the collective intelligence of the organization.