Google and Yelp have had some issues for sometime, following a failed acquisition attempt, but it's rare that the tensions between the two companies are aired for an audience. That is just what happened at TechCrunch's Social Currency Crunchup event. Yelp CEO Jeremy Stoppelman and Google VP of Product Management John Hanke shared a stage and talked a bit about their situation. TechCrunch's MG Siegler shares his account of the experience here . Essentially,