The Canadian company Bunz began as a Facebook group in Toronto for people to barter their unwanted belongings. A t-shirt for a mug. A coffee table for a lamp.

Bunz got very popular, introduced an app, and eventually the next step for a barter economy: a currency.

Now it has expanded its micro-economy to brick-and-mortar businesses. And, it’s trying data mining from users who receive a portion of the revenues.