HumHub is a feature rich and highly flexible OpenSource Social Network Kit written in PHP. It provides support to build Social Intranets, Enterprise Social Networks, Private Social Networks. Its social features include Commenting, Like, Following, Mentioning, Tags, OEmbed Support. The communication in HumHub works with spaces. A space can literally be anything, a project, a group or just a simple topic. For every space you can invite multiple users and make up your own access rights and rules.

HumHub - Open Source Social Network

StatusNet is a microblogging platform. It helps people in a community, company, or group to exchange short (140 character) messages over the Web. Users can choose which people to “follow” and receive only their friends' or colleagues' status messages. It provides a similar service to sites like Twitter or Yammer.

Statusnet - Microblogging platform powers Identi.ca

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including 
   <UL>
	<LI>Profiles</LI>
	<LI>Social bookmarking</LI>
	<LI>Groups</LI>
	<LI>Activity Streams</LI>
	<LI>Access controls</LI>
	<LI>Blogging / Microblogging</LI>
	<LI>Web Services API</LI>
	<LI>Pages</LI>
	<LI>RSS / JSON</LI>
	<LI>Widgets</LI>
	<LI>Video</LI>
	<LI>Documents</LI>
	<LI>Photo Gallery</LI>
 </UL>

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including Profiles, Groups, Activity Streams, Access controls, Blogging / Microblogging, Web Services API etc.

Elgg

BuddyPress provides social networking features to a WordPress. It works well to enable people with similar interests to connect and communicate. It supports Content tagging, Grouping of similar activity stream items, AJAX live updating of site wide activity stream, Message archive, Better XProfile management and lot more. 

Buddypress - Social Networking features in WordPress

ShareNice provides an ethical social sharing widget. It helps users to be able to share your web pages with their friends through social networking sites without having to give any information away to money-making third parties. There are two ways you can make use of shareNice, you can choose hosted version or host on your own using the code.

ShareNice - Social Sharing Widget

Voten.co is a real-time social bookmarking for the 21st century. It's real-time, beautiful, customizable yet simple. 

Voten - The code that powers voten.co

Friendica is a communications platform for integrated social communications utilising decentralised communications and linkage to several indie social projects as well as popular mainstream providers. It provides fully distributed communications protocols ("DFRN" and "Zot!") for securely sharing with your friends across the internet.

Friendica - Facebook alternative

PixelFed is a federated social image sharing platform, similar to Instagram. Federation is done using the ActivityPub protocol, which is used by Mastodon, PeerTube, Pleroma, and more. Through ActivityPub PixelFed can share and interact with these platforms, as well as other instances of PixelFed.

Pixelfed - Federated Image Sharing (WIP) 

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