1. A method, comprising: implementing, by a server, a communications service that collects entity data including a first plurality of communication addresses associated with a first entity of a plurality of entities, the first entity having previously sent communications to persons other than a user of a computing device, the user and the persons other than the user associated with the communications service; identifying, by the server, patterns of matching text strings in communication addresses previously used to send communications from each of the plurality of entities to persons other than the user to associate each of the communication addresses with a corresponding one of the plurality of entities, the identifying the patterns comprising comparing a text string in a first one of the communication addresses to a text string in a second one of the communication addresses in order to identify a match; associating, by the server, the first plurality of communication addresses with the first entity based on the patterns; and in response to the computing device of the user receiving a first communication from the first entity, transmitting the first plurality of communication addresses from the server to the computing device to store the first plurality of communication addresses in a memory of the computing device, wherein the first communication from the first entity is received at the computing device at a time after the persons other than the user have received communications from the first entity; wherein the computing device is configured to create a first entity profile customized for the user in response to receiving input from the user to initiate a communication with the first entity, the first entity profile comprising: (i) the first plurality of communication addresses, (ii) a link for an online service with the first entity, and (iii) information specific to the user's relationship with the first entity other than communications between the user and the first entity; wherein the computing device has not previously received a communication from the first entity prior to receiving the first communication.