Mastodon
You can find me on Mastodon, a federated microblogging platform with features similar to Twitter.
I chose todon.eu as my home server, "a leftist and anti-authoritarian Mastodon server for progressives, socialists, anarchists, activists, environmentalists, vegans, anti-racists, anti-fascists, anti-capitalists, pirates, LGBTQIA+, human rights activists, etc."
For help choosing an instance, try this website.