I dont know if there exists already this option on Plus, but my question is, if theres a script or something that you can use to see the date you added a contact to your list. For example, "Contact A" - Added on June 13, 2007.. etc etc..
I don't think there's anything that could retrieve the dates in which you added someone but I can surely see how this could be done and active from the moment you install the script.
Script could create a registry entry for each contact or just make a textfile with the date for each contact and then whenever you wanted the script would show you the list.
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