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Super cool! Are you considering federation a la ActivityPub et al?

Just thinking of a way for you to really stunt with what MySpace could have been that Facebook or Twitter would never do.

And even if federation is too big of a feature, maybe using the ActivityStreams format for user interactions could be beneficial.

And if activitystreams are still too bloated you can look into microformats2 and webmentions (indieweb).