Referral loop

<div class="stage"><div class="label">INVITE → JOIN → INVITE</div><div class="tree"><div class="person root">A<small>USER</small></div><div class="branch b1"><div class="person">B</div><div class="person">C</div></div><div class="branch b2"><div class="person">D</div><div class="person">E</div><div class="person">F</div><div class="person">G</div></div></div><div class="hint">EACH JOIN CAN START A NEW INVITE</div></div>

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