Online Communities

Try these:

Google Community the new way to stay in touch with your social or work group. Think of it as the business equivalent of Facebook.

Yammer – a free discussion forum. Relatively easy to use. You can provide attachments.

LinkedIn – you can use LinkedIn to run a group discussion. It is more text based and doesn’t allow attachments.

All of these allow alerts to be sent to you to let you know someone has posted to the group.