Check out https://JoinMastodon.org
"Mastodon is a federated social network, with similar features to Twitter, but administrated as a decentralized federation of servers running open source software. Users belong to a single Mastodon server, known as an "instance", where they post short messages for others to read, subject to the privacy settings of the user and instance. The service seeks to distinguish itself from Twitter through its orientation towards small communities and community-based, rather than top-down, moderation. Like Twitter, Mastodon supports direct, private messages between users, but unlike "tweets" posted on Twitter, Mastodon "toots" can be private to the user, private to the user's followers, public on a specific instance, or public across a network of instances. The network of federated Mastodon instances forms one part of the Fediverse, a federated network that includes servers running any social network software that uses OStatus." From Mastodon Social Wikipedia page.
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