GNU social

vs

Pixelfed

Mastodon is a free and open source decentralized social network that is used by over 4.4 million people. At mastodon you can follow friends, discover and rally around topics, and share links, pictures, text, video, much like Twitter. The main difference with Mastodon is the decentralized nature of the software. Anyone is free to start their own Mastodon server, that automatically interconnects with all the other Mastodon servers. Since the network is community-owned and not backed by any venture capital you can be sure that your data will not be monitized and that you will have an ad-free experience.

A free and open-source modern forum software written in PHP. With Flarum you can eaisly setup your own discussion froum and host it online.

Discourse is an open source internet forum and mailing list software. The application is written with Ember.js and Ruby on Rails, and can be self-hosted in the cloud or on local hardware for free. Discourse also provides managed hosting starting at $100/month, so that you can focus on building a community rather than installing software and managing servers.

Imgur is a free image sharing and hosting service that is commonly used by people that want to share images on social media. With Imgur users can discover, share and discuss their images with others online.

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.

Instagram is a photo and video-sharing social networking that aims to bring you closer together to the people and things you love. Take a photo with your phone and choose a filter to enhance it, and upload it Instagram in a few simple steps. Instagram is available for mobile devices including Android, iOS, Blackberry and Windows Phone, as well as a web-based version available in the web browser.