Interesting. Maybe the name Dunbar can be replaced by a term which doesn't require insider knowledge? And can also set the depth of the web of Trust? Like 1, 2, 3 levels? Hmm maybe the Dunbar setting can be name related to the width (per follow) to be taken of the follow graph , and the depth is as explained above? Probably you won't read my message because I'm not on your follow list. You could add a feature that you also accept people who has zapped you above a certain threshold, this would mean they have something so important to say that they are willing to pay you to listen:)