[zalew]

if by 'Here in Europe' you mean 'here in Germany' then yeah, in Germany cards are unpopular among small business, but here in Poland they are quite common. There is often a minimum ammount in private grocery stores, but you can pay in every corporate store or cafe like Coffeeheaven and Starbucks.

[StavrosK]

Cards are likewise unpopular in Greece. You can usually use them pretty much everywhere, but almost nobody does.

[wtvanhest]

In the US, cards dominate