@James Chip It depends a lot of type of software. For Masto it is true, but Mastodon is not the only social software and there are other which are more targeted to make online archive and they are good at it. In fact, "websites" like Wordpress sites can have ActivityPub plugin and archive portals can have social features too. And it is good idea, you can follow new accessions on archival portals and other news. Archives can actually be social sites.