In addtion to that @kvinata, maybe we could trigger a 'Visit Event' that can boost Relationship Points earned when interacting with their Sims as a reward for visiting.
And as a bonus, maybe even have a Chat with them when they are online in-game. Notifications also come to the player to claim 'Visit Rewards', that being Relationship Points for his Sim to yours.
And also, I want to suggest about being able to move the mailbox, somehow, for design purposes I want it near my doorstep because I'm putting up foliage in front of my home. Of course, the mailbox cannot be put into storage.
Or how about just acquaintances (a separate tab). These are people I met and talked to but they are not my friends.
