Well, not 280 character specifically, but I can deploy a myriad of forums and image/text boards in minutes. I suppose in the config file I could limit text posts to 280 characters but I would rather leave it a bit bigger.
Forums can be federated on the backend with database replication or LDAP which is also basically database replication. I suppose tooling could be created to manage LDAP branches so that people could replicate sub-sets of data read-only and some sub-sets read-write. I know I just made some admins heave a bit. Using one of the now-sanctioned Russian forks of OpenLDAP ReOpenLDAP [1] the federation could scale to several million users so at some point that code would have to evolve again to reach Twitter scale. What is their active user count?
Some IRC daemons can also use LDAP for identity. No idea if Matrix can support LDAP.
Forums can be federated on the backend with database replication or LDAP which is also basically database replication. I suppose tooling could be created to manage LDAP branches so that people could replicate sub-sets of data read-only and some sub-sets read-write. I know I just made some admins heave a bit. Using one of the now-sanctioned Russian forks of OpenLDAP ReOpenLDAP [1] the federation could scale to several million users so at some point that code would have to evolve again to reach Twitter scale. What is their active user count?
Some IRC daemons can also use LDAP for identity. No idea if Matrix can support LDAP.
[1] - https://abf.io/erthink/ReOpenLDAP