Your question is very generic, too. Startups targeting consumers are different from startups targeting enterprises. What users do you address? What about the business model you have in mind? The size of your market? Has your product viral features built in? etc, etc, etc. I think it is presumptuous to believe that there is a single marketing strategy that may fit all startups in the world...
true, one size can't fit all - though i think major YC cos. are mass consumer base (than enterprise soln.) so buzz creation tool for most of them will be more or less the same (may be i'm wrong).
