SharePoint: Integrate Skype and Facebook Features
See the following sections for information about how to integrate Skype and Facebook features into your SharePoint site.
SharePoint 2010 also includes many social features: http://www.orbitone.com/en/blog/archive/2010/05/04/sharepoint-2010-social-features.aspx
This site includes code for most of the social networking sites: http://www.addthis.com/
Skype
Create a column that associates with Skype protocol (for SharePoint 2007):
This is a Facebook kit for SharePoint, where you need to create a visual webpart and use it:
Facebook SDK to integrate a project on SharePoint:
Source
This information originally came from this TechNet Forum thread: Facebook & Skype on Sharepoint
The primary contributors are Andre Lage (Microsoft Partner and MVP) and Bharath Ch (Microsoft Partner).