The normal terminals aren't giving me much to work with as they're more "go here/do this/that's it", so I'm gonna comment on the more jokey ones.
Pretty amusing to see something recounting events from the late 1980s in a scenario that's supposed to be about as far in the future as Marathon. Speaking of--I guess the UESC Marathon exists in this 'verse (as does Lh'owon)? And there's at least one Jovian outpost.
According to the Green Card term, fax machines are still in use. I mean, they still are nowadays to some extent, but I'unno how many people actually send messages that way... (Also--I see you, Dune reference)
AOL as a major service this far into the future...well, AIM's gone and I don't know if it's still possible to access whatever communities were part of AOL.
Gameplay-wise, perhaps the multiple SPNKRs were meant for your co-op buddies.