Diaspora is distributed and contextual social networking. It is decentralized and provides freedom and privacy. Instead of everyone’s data being held on huge central servers owned by a large organization, diaspora* exists on independently run servers (“pods”) all over the world. You choose which pod to register with, and you can then connect seamlessly with the diaspora* community worldwide.
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In diaspora* you own your data. You don’t sign over rights to a corporation or other interest who could use it. In addition, you choose who sees what you share, using Aspects. diaspora* pioneered the concept of aspects, which means you can organise your contacts according to their role in your life. This means you can share something just with family members or work colleagues, knowing that no one you don’t want to will be able to see what you post.

Diaspora is distributed and contextual social networking. It is decentralized and provides freedom and privacy. Instead of everyone’s data being held on huge central servers owned by a large organization, diaspora* exists on independently run servers (“pods”) all over the world. You choose which pod to register with, and you can then connect seamlessly with the diaspora* community worldwide.

Diaspora - Distributed and contextual social networking

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

Photographer.io is a new photo community for sharing your photographs. You can Upload, organise, and share your photographs. Every user can make a maximum of 10 recommendations per day. A recommendation helps promote the photo on our recommended page but will soon recommend the photo to your followers too. 

Photographer.io - Photo Sharing Community

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

pump.io is a stream server that does most of what people really want from a social network. You post anything and my followers see it. It is an alternative to twitter. You can post almost anything that can be represented with activity streams -- short or long text, bookmarks, images, video, audio, events, geo checkins. You can follow friends, create lists of people, and so on.

pump.io - Social server with an ActivityStreams API

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

Lovd is a social networking solution that has everything you need to build your community. Its feature include
   <UL>
	<LI>Follow a user, mutual following is friending.</LI>
	<LI>User-to-User Messaging</LI>
	<LI>Profile Comments</LI>
	<LI>User Blogs with Comments</LI>
	<LI>Photo Gallery with Captions</LI>
	<LI>Site Search for Friends</LI>
	<LI>Profile Bio and Information</LI>
	<LI>User Dashboard (Recent Activity of Friends)</LI>
	<LI>Emailed Activity</LI>
	<LI>Flickr Integration</LI>
	<LI>YouTube Integration</LI>
 </UL>

Lovd is a social networking solution that has everything you need to build your community.

LovedByLess

digsby is a multiprotocol IM client that lets you chat with all your friends on AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber with one simple to manage buddy list. It is also a social networking tool that alerts you of events like new messages and gives you a live Newsfeed of what your friends are up to. It also alerts you of new email and lets you perform actions such as 'Delete' or 'Report Spam' with just one click.

Digsby -  IM + Email + Social Networks

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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