They write about themselves:
"SocialFactor provides an environment within the SharePoint 2010 Enterprise Social Network where people can leverage their relationships to get things done together. Everyone can start public or private conversations on profile pages, get involved in communities or create new communities. Conversations can start in the social network and continue in the e-mail, allowing users to adopt the new collaboration behaviors at their pace without slowing the whole group's progress. SocialFactor also fosters the manual sharing or the self-propagation of information and interactions in the social network."
Recommended by Sam Marshall, Clearbox Consulting as a good alternative to Yammer.
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