Ok so i was thinking and what do you think to a freinds list, there can be a command online e.g. /add (minecraftname) then you get a message you can /accept add or /decline add.
or if your not on a server but you know someones name there should be a option on the first screen that has a friends list, this shows you your current friends on and offline and gives you a button to add friend please tell me what you think