I spent time with Sarah Lacy and we talked about… I’m sure you heard about the infamous Mark Zuckerberg SXSW keynote hosted by well known author, Business Week columnist and Yahoo TechTicker host Sarah Lacy. Just in case you haven’t, let’s just say that some of the audience wasn’t supportive of the casual, conversational format or her style of engaging Zuckerberg in public.   From the get go, many believe that this interview was destined to fail. The angst and…