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bbPress is forum software from the creators of WordPress. With bbPress you can quickly setup a forum for asyncronous discussion and subscriptions for your WordPress-powered site.

A flexible WordPress plugin for building online communities, teams, and groups with WordPress-powered sites.

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.