Hmmm, I would never use such a system as for one thing - if people aren't contacting me, why should I care about contacting them? I have several 'best friends', maybe twice that 'friends', and then a bunch more I interact with sometimes, and I feel this is relatively normal. Also, I don't care actually if it's not normal, and don't feel I'm missing out on anything. That said, I'm quite the introvert and generally val…
I see this system as a way of preventing backsliding into rarer and rarer interactions when they aren't pushed by common activities.