Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
Friendica - Decentralisation - Privacy - Interoperability
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.
MeWe - Used to be called Sgrouples, now its MeWe offered by the company Sgrouples Inc.
phpFox - phpFox is a powerful social network platform for niche communities