1. A computer-implemented communication method comprising: from each of a plurality of receiving users, receiving by a computer system corresponding personal health message receiving criteria for determining messages to be received by that receiving user via at least one of e-mail and a personal homepage, the corresponding personal health message receiving criteria for each user including at least one of a personal characteristic, a predefined health condition, and a receiving user-defined health condition that is relevant to that receiving user; from a transmitting user, receiving a plurality of messages intended for at least one of the receiving users, wherein each message includes i) personal health message transmitting criteria selected by the transmitting user for directing each received message to other users, the personal health message transmitting criteria including at least one of a personal characteristic, a predefined health condition, and a transmitting user-defined health condition that is relevant to at least one of each received message and the transmitting user, and ii) a communication for at least one of the receiving users, wherein each of the plurality of messages is generated by the transmitting user from a transmitting user interface displayed on a display that includes at least one field allowing the transmitting user to select the personal health message transmitting criteria and at least one field to compose the communication; comparing, by the computer system, the transmitting criteria in each of the plurality of received messages to the personal health message receiving criteria for each of the plurality of receiving users to identify matches; and transmitting each of the plurality of received messages to identified receiving users comprising at least one of the receiving users via at least one of an e-mail and the personal homepage without identifying the identified receiving users to the transmitting user, the transmitting being based on a match between the transmitting criteria and the receiving criteria.