Mastodon is a Free and Open Source federated social network, made with a focus on more personal interaction.
Twitter is an online social networking service that enables users to send and read short 280-character messages called "tweets".
Diaspora is a federated social networking service, designed to be a more privacy-aware alternative to Facebook . Share what you want, with whom you want.
Gab Social is an open source and fully decentralized social network powered by the Gab Platform. It is the new social network of Gab.com. This change was made to further Gab's commitment to its users trust and privacy online.
Gab is less moderated compared to other social networks and could be offensive to some people
We are a free and open-source platform to launch your digital brand, social network and mobile app. We are also a social network ourselves. It is a global social network of social networks. Available in either decentralized or centralized options.
Free online social media and network service connecting people with friends, family, classmates and more.
Friendica is a distributed social network application. Which allow users to connect with others via their own Friendica server, but may also fully integrate contacts from other platforms including Twitter, diaspora*, Pump.io and StatusNet into their 'newsfeed'.
GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications. It is widely supported and has a large userbase.
VK (originally VKontakte) is a largest social network service from Europe. Available in many languages and highly popular particularly among Russian-speaking users around the world, especially in Russia, Ukraine, Kazakhstan, Moldova, Belarus, and Israel.