Steem is a Delegated Proof of Stake blockchain that uses a "Proof of Brain" social consensus algorithm for token allocation. It is a blockchain-based rewards platform for publishers to monetize content and grow community.
 
Running a rewards-based decentralized social network required new advances in blockchain technology. Steem is a next-generation blockchain, uniquely designed to run real-time applicaitons with near instant, fee-free transactions.

Steem is a Delegated Proof of Stake blockchain that uses a "Proof of Brain" social consensus algorithm for token allocation. It is a blockchain-based rewards platform for publishers to monetize content and grow community.

Steem - The blockchain for Smart Media Tokens (SMTs) and decentralized applications.

This is the Apollo/GraphQL version of Telescope, now known as Vulcan. It is a framework that gives you a set of tools for quickly building React-based web applications. Out of the box, it can handle data loading, automatically generate forms, handle email notifications, and much more. It provides simple building blocks such as posts, comments, forms, and modals, and makes it easy to quickly customize them to build modern, social web apps. 


Vulcan - A toolkit to quickly build apps with React, GraphQL & Meteor

Reddit is a web-based social bookmarking system. It allows multiple users to store, share and tag their favorite links online. Users will provide the content (links) and decide through voting what's good and what's junk. Links that receive community approval bubble up towards #1, so the front page is constantly in motion and filled with fresh and interesting links. Sub groups (community) could be created and each groups could be moderated by its owners. 
 The content are indexed and available for search. <A HREF="www.reddit.com" target="_blank">Reddit</A> has millions of page views per day and it has highly scalable architecture, written in Python. It has API support, Private messaging, User profile management, Comments etc.

Reddit is a web-based social bookmarking system. It allows multiple users to store, share and tag their favorite links online. Users will provide the content (links) and decide through voting what's good and what's junk. Links that receive community approval bubble up towards #1, so the front page is constantly in motion and filled with fresh and interesting links. Sub groups (community) could be created and each groups could be moderated by its owners.

Reddit - Social bookmark engine 

Pligg is an open source CMS (Content Management System) which provides social publishing software that encourages visitors to register on your website so that they can submit content and connect with other users. Our software creates websites where stories are created and voted on by members, not website editors. It is a user driven CMS that relies on independent authors content and participation to manage news articles. It has support for Groups, Private messaging, User profile management, SEO support, RSS feeds and lot more. It is a CMS with social publishing feature.

Pligg is an open source CMS (Content Management System) which provides social publishing software that encourages visitors to register on your website so that they can submit content and connect with other users. Our software creates websites where stories are created and voted on by members, not website editors. It is a user driven CMS that relies on independent authors content and participation to manage news articles.

Pligg - Social Publishing CMS

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.
 
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

KiGG is a Web 2.0 style social news web application developed in Microsoft supported technologies. It allows multiple users to store, share and tag their favorite links online. The links could be tagged and Users will allowed to vote up or down the links. It rates the User based on their links posted and votes received. SQL Server or MySQL could be used as database back end. It powers websites <A HREF="http://www.DotNetShoutout.com" target="_blank">DotNetShoutout.com</A> - A site where you find links for .NET stories.

KiGG is a Web 2.0 style social news web application developed in Microsoft supported technologies. It allows multiple users to store, share and tag their favorite links online. The links could be tagged and Users will allowed to vote up or down the links. It rates the User based on their links posted and votes received. SQL Server or MySQL could be used as database back end. It powers websites DotNetShoutout.com - A site where you find links for .NET stories.

kigg - Social bookmarking engine in ASP.NET

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

Pinry is a a tiling image board system for people who want to save, tag, and share images, videos and webpages. 

Pinry - A tiling image board system, Alternative to Pinterest

Mastodon is a free, open-source social network server. A decentralized alternative to commercial platforms, it avoids the risks of a single company monopolizing your communication. Anyone can run Mastodon and participate in the social network seamlessly.

Mastodon - A GNU Social-compatible microblogging server. Alternative to Twitter

GNU social is a free social networking
platform and it is a continuation of the StatusNet project. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome.
 
With a little work, status messages can be sent to
mobile phones, instant messenger programs (using
XMPP), and specially-designed desktop clients that
support the Twitter API.

GNU social is a free social networking
platform and it is a continuation of the StatusNet project. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome.

GNU Social - Microblogging, Alternative to Twitter

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

Hotaru CMS is a PHP platform for building your own websites. The most common use for Hotaru is social bookmarking. It has all the plugins you need to make your own Digg-style community. It is a framework for making websites customized to your needs. It has support of User and group management. Users could login from Twitter, Facebook, Yahoo and Google. It does have API support for developers. The CMS functionality could be extended via plugins. Its main purpose is of Social Bookmarking, where Users can share URLs with others. Users could add tag, increase or decrease the vote, add comment etc. It has Anti Spam support.

Hotaru CMS is a PHP platform for building your own websites. The most common use for Hotaru is social bookmarking. It has all the plugins you need to make your own Digg-style community. It is a framework for making websites customized to your needs.

Hotaru CMS - Plugin Powered PHP based CMS Engine

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

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