How feasible would it be to add a small tag systems for friends? In such a system I would be able to write a note as to why I added this person.

Some people I've only added because they have a useful house, they run plasma queues, they rec for fort, or I can use them as gift-4-gift. It would be good to have this reminder because I often forget after a month or less of not interacting.

Discord has a similar system.