[aembleton]

The ability to get a single feed of what they are doing that they can easily send out to everyone without having to create a mailing list.

Being able to easily react to any status that your friends post, and being able to comment on that. The email equivalent would be a separate email thread for each status update from each friend. That would quickly get messy.

And a big one for me is being able to create an event, and invite friends to it. Any updates to said event can then be communicated to all those interested without you having to make updates to a list of email addresses.