Using the group forum, or an online meeting place (e.g. Skype, OU Live or Google Hangouts), agree on the roles in your team and their assignment. Consider the following options:
Team leader: schedules and chairs team discussions, proposes a division of tasks among team members, resolves tensions within the team, communicates the project progress to your tutor and other interested parties.
Project manager: monitors task progress, identifies risks and alerts the team to any deviation from the project plans.
Media manager: manages the project site and any other communication channels.
Other roles you suggest or deem necessary depending on group size.