On the topic of ownership in federated and p2p social networks Show more
I really think social network protocols should include mandatory license metadata.
And obviously this should include a license designed for "you may share this in the social media network in which I have published it, but nothing else" as a default.
Having the network be aware of which media are Creative Commons licensed is potentially very powerful - especially in the case of aggregators that can then link to source and license.
Octodon is a nice general purpose instance.