The sovereign debt literature emphasizes the possibility of avoiding a self-fulfilling default crisis if markets anticipate the central bank to act as the lender of last resort. Motivated by the recent European sovereign debt crisis and the “Whatever it Takes” episode, this project investigates the extent to which changes in beliefs about an intervention of the European Central Bank (ECB), via a bailout program, explain the sudden reduction of government bond yields for the so-called PIIGS countries. To proxy beliefs, we study Twitter data from July to September 2012 and extract beliefs using machine learning techniques. Our preliminary results, only based on our training sample, suggest that the drop in sovereign yields can be explained by changes in beliefs about the central bank intervention that effectively coordinated beliefs away from the self-fulfilling equilibrium.