Abstract: A system for transmission of data between a first device operated by a first user and a second device operated by a second user comprises a database that is in network communication with the first device and the second device. The database receives a first set of data input by the first user and a second set of data input by the second user. Additionally, the database allows the second user to access a first portion of the first set of data only after the second user authorizes the first user via the database to access a first portion of the second set of data. The database can be configured so that the first user is authorized by the second user once the first user inputs a user-specific identifier of the second user into the database.