Facebook
Free
Facebook is the world's largest social network platform.
Diaspora
Open Source
Diaspora is a nonprofit, user-owned, distributed social network that is based upon the free Diaspora software.
Yammer
Commercial
Yammer is a freemium enterprise social networking service used for private communication within organizations.
kune
Open Source
kune is a distributed social network software.
Tumblr
Free
Tumblr is a microblogging and social networking website.
HumHub
Open Source
HumHub is a free social network software and framework built to give you the tools to make teamwork easy and successful.
Jostle
Commercial
Jostle is a people engagement platform mainly focused on employee engagement.
ZeroMe
Open Source
ZeroMe is a social networking platform.
