Bitcoin's "innovation in trust," radical self-reliance, and social scaling. Everyone is following the same consensus rules. It is an emergent model for trust in a decentralised network-centric, game theoretical, market-based security system.
We're at the infancy of this technology, so right now it's very difficult for individuals to secure their own bitcoin; this creates a tendency to concentrate funds and rely on third parties.
There are two kinds of centralised exchanges: those that have been hacked and those that will be hacked. The problem is a technical skills gap - we need to make bitcoin reflexive and easy secure without centralising it. We don't need perfect security, we need reasonable certainty.
The people deeply involved in Bitcoin right now are the lunatic fringe, the "early adopters" are still five years out. If your friends are making fun of you, you're probably doing something interesting.
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