The Tribe Site is FREE to browse within Australia for Telstra customers with a compatible Next G™ mobile. All posts and uploads within Tribe are free of charge. Note Telstra’s Fair Use Policy applies with a limit of 600MB usage per month on the Tribe Site. Browsing charges only apply when you leave Tribe and access Facebook, Twitter and MySpace directly. Standard SMS and MMS charges apply for uploads sent using SMS and MMS.
Charges will also apply for all browsing when roaming internationally.
Tribe alerts delivered by SMS are FREE of charge Standard SMS and MMS charges apply to send messages back to the Tribe service on TRIBE (87423).
Introduced from today i think.