i like web of trust as it's descriptive, but as you say google may have already squatted on the term so it could lead to someone confusion.
from a hermetic perspective we could consider some terms like 'sphere of resonance'? or perhaps 'fractal bonds'?
or perhaps even '2nd order friends' or 'circles of connection'. both could be extended to first, second or nth order / circles
you could call it "social graph" that's pretty generic
web of trust was first coined by the PGP devs i believe, and it's part of key server protocols (signing on other people's keys)
