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Upvotocracy

An open platform for decentralized social networks and marketplaces.  It's censorship-resistant and has built-in monetization methods. Built with Polkadot and IPFS tech stack.

GNU social connects you to a free network of thousands of communities that discuss daily on a variety of topics, each being part of the whole. GNU social supports both single-user and community modes and can be used in an intranet environment or as part of the wider open network. The free and open source microblogging server is written in PHP and built on-top of the OStatus standard for inter-operation between installations.

With JomSocial you can quickly setup a social network for your Joomla-powered website. The extension is built to be friendly to both developers and regular Joomla users. Features you have come to expect from a social network such as activity streams, comments, featured posts, hashtags, mentions, video shares, photo shares, location shares, moods, polls and more, is all included in the JomSocial extension for Joomla. Currently over 180,000 communities globally use JomSocial to power their social network.

Reddit is a social news aggregation network and community. On reddit people can share and discuss web content in user created communities called subreddits. Each subreddit rally around specific topics where only related content can be shared, and rated. The web content that can be shared or reddit includes links, text posts, and images which can all be upvoted or downvoted.

Steemit is a blockchain-based blogging platform and social media application that rewards its users with the cryptocurrency STEEM for publishing and curating content. On Steemit you can publish blog posts on any topic and get rewarded by doing so. You can also be rewarded by upvoting and curating post that the other users deems noteworthy.

Hacker News is a social news website initially built by YC co-founder Paul Graham as a demonstration of Arc, a new programming language he'd been working on. Today Hacker News is a go to source for news and discussion surrounding computer science and entrepreneurship, used by millions of people monthly. The site facilitates deeper nested discussion about technology, science and is used by startups and people promoting new ideas in ShowHN section.