A method comprising: receiving two or more user identifiers and a request to establish a messaging group, each user identifier being associated with a different user device with a different instance of a messaging application on the respective different user device; establishing the messaging group to enable communication between the different user devices; receiving a plurality of messages; routing the plurality of messages to the respective different instances of the messaging application; receiving a request to add a new member to the messaging group, the request including identity information of the new member and insertion information, the messaging group being associated with a thread of message history; determining an insertion point in the thread of message history; adding the new member to the messaging group to enable the new member to communicate with other members of the messaging group and to see messages up to the insertion point.