Stealthy: Secret Messenger - Chat anonymously with friends & strangers
SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
Whisper.sh - Whisper is the best place to express yourself online. Connect with likeminded individuals and discover the unseen world around you.
JomSocial - Open Source Social Networking Software. Award winning open source community software by JomSocial. This social networking software is widely used by many Joomla users.
YouHue - A fun new way to ask "How are you?"
EasySocial - Social Network For Joomla to grow your communities with the least time.