This column critically examines the hypothesis that the Internet is responsible for creating echo chambers, in which groups can seal themselves off from heterodox opinion, via filtering and recommendation technology. Echo chambers are held responsible by many for political polarization, and the growth of extremism, yet the evidence doesn't seem to support this view. Echo chambers certainly exist, and can be detrimental to deliberation and discussion, but equally have a role to play in group formation, solidarity, and identity. The case for intervening in Internet governance to suppress echo chambers is not proven.