1. A system comprising: a first device logged into a first user account and configured to request authorization to perform a restricted activity on the first device by transmitting a request signal through a network before performing the restricted activity, receive an authorizing signal through the network, and perform the restricted activity in response to receiving the authorizing signal, wherein the restricted activity includes accessing restricted content; and a second device logged into a second user account and configured to receive the request signal from the first device through the network, display an authentication input for authenticating an authorized user associated with the second user account, display an authorization input for authorizing the restricted activity on the first device, and transmit the authorizing signal through the network if the second device is authenticated and if the first device is authorized, wherein content on the first device that is common to the first user account and the second user account is not restricted content.