SXsocial is open to all registered SXSW attendees and speakers. If you cannot log in, it may be because you have not yet been registered. As a speaker you will not be registered for the event until you have signed your speaker agreement.
If you ARE registered and have lost your password, please contact firstname.lastname@example.org for assistance. Close to the event, the SXSW support team is swamped with a variety of tech requests, so please be patient. They will assist you as quickly as they can.