i'm not sure what a breakup can accomplish beside populist political goals. I meant to avoid losing the great societal benefits of the large networks the resulting post-breakup components/parts would have to be interoperational. Then why not enforce interoperability upon the too big players right now? Why not enforce that any client can be used for Twitter, that any player can federate/aggregate Twitter, and that any user can firehose its own data and the data of any users who gave permission? Why not enforce Facebook to allow firehose the data in similar manner and to accept posts/updates/etc. from other social networks, like posting Snaps into IG feed? Or Lyft (or some small unknown operator) ride requests routed through Uber. Any "platform" should come with API gateway with legally enforced generous performance guarantees and providing read/write access to all the user data and user visible services of the "platform". That would increase competition, give small and innovative players a chance, decrease the "winner takes all" with associated excesses and distortions and provide even greater societal benefit of making those networks even larger without the networks controlled by any one "platform". Instead of costly and obsolete breakup approach, the enforcing of interoperability and data access must become the battle cry of progressives. That would be the infrastructure of the 21st century which would even allow to efficiently approach even the super-issues like healthcare.