A method and system for updating contact details of users is disclosed. The method comprises providing a contact record for each of a plurality of users, the contact record for each user comprising a plurality of fields, wherein at least one of the contact records for a first user has a first user identifier in a first field having an associated first communications method. A subsequent step may comprise receiving a communication from a user by means of a second, different communications method, the communication having an associated second user identifier corresponding to at least part of the first user identifier. A subsequent step may comprise identifying the contact record for the first user based on the second user identifier. A subsequent step may comprise updating the identified contact record so that at least one of the fields comprises new information from the second user identifier.