Abstract: Systems and methods for selectively authenticating an untrusted device based on a trust level are disclosed. The system can include transmitting an authentication request from a first device seeking to authenticate a second device to access to an account. The first device receives an authentication token that can be used by the second device for authentication. The authentication token can be transmitted wirelessly to the second device or can be scanned by the second device in the case that the token is a scannable image displayed on the first device. The systems can determine a trust level for the second device based on an association between the first device and the second device. The system can provide the second device a degree of access to the account that relates to the trust level.

Abstract: A method for providing a calendar service to a first user is provided. A user interface is provided to a computing device of the first user. The user interface includes a calendar of the first user. The first user is associated with a calendar of a second user. The first user can view, on the calendar associated with the first user, one or more activities offered by the second user. The one or more activities are capable of being individually joined by the first user. A user input to join an activity offered by the second user is received. In response to receiving the user input, an entry for the joined activity is added in the calendar of the first user, and information for the accepted activity is modified in the calendar of the second user.