A method for delivering messages performed at a server includes: generating a group-sending interface invocation request, and sending the group-sending interface invocation request to an open platform server, where the group-sending interface invocation request carries a to-be-sent message and at least one group identifier, a follower group corresponding to each group identifier includes a user account of at least one follower of a target user account, the target user account is a user account that a service provider applies for to the social networking application, the group-sending interface invocation request is used to invoke a message group-sending interface provided by the open platform server, and the message group-sending interface is configured to send a message to a client terminal corresponding to a user account in a follower group corresponding to each of the at least one group identifier.