Definitions by Paul Furfari
keystone friend
The person in a large gathering of strangers and acquaintances that knows everyone and brought them together.
I went out to a bar with my friend John and a bunch of other people I didn't know. It was some people from John's work, a few of John's college roommates and one of his friends from home. We all didn't know each other, but John was the keystone friend.
keystone friend by Paul Furfari March 12, 2007