WordPress.com

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Quora

WordPress powers roughly 30% of all web pages online. It's a free and open source CMS designed and developed for self-hosted publishing by Automattic, Inc. The software is written in PHP and utilize either MySQL or MariaDB as a database, and is compatible with most web hosts. Wordpress includes a plugin architecture and a templating system that can be used to extend and customize your website. These are commonly known as WordPress plugins and WordPress themes and make up a whole open source and commercial eco-system where anyone is free to create products for the platform. 

Medium is an open bloging and publishing platform where readers find dynamic thinking, and where expert and undiscovered voices can share their writing on any topic.

Tumblr is a an easy to use microblogging site and social network first released in 2007. On Tumblr, people can share stories via blogs and other media such as photos, GIFs, links and third party platform embeds such as Spotify playlist and tracks. All users of Tumblr can follow each other to get up-to-date content from the creators you live. There is also private publishing features which allow you to share your stories only to a select group or community. Over 500 milion people use Tumblr to share contet on the web for free.

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.

Medium is an open bloging and publishing platform where readers find dynamic thinking, and where expert and undiscovered voices can share their writing on any topic.

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.