Publishing platform Medium is opening up its debut Mastodon instance, me.dm, to its members, the company announced today. Last month, Medium first teased its plans around the Fediverse — the group of interconnected servers powering a range of open source, decentralized applications, including the Twitter alternative Mastodon and others. It said it wanted to make access to me.dm a perk included with Medium membership, offering a place for authors and readers to discuss the content published on its plat...