“The posts each took 4-8 weeks of full-time work for him to write. Plus another 2-4 weeks of dedicated programming time from someone else on the team. It’s easy to look at an OkTrends post, with all its simple graphs and casual writing style and think someone just threw it together, but it probably had 50 serious revisions. And we threw out a lot of research that didn’t turn into good posts. Your startup probably can’t afford to do this. It shouldn’t waste like 10 man weeks of effort/focus/money on writing a blog post.”

How important was blogging to OkCupid’s success? - Quora