It seems like every venture capitalist these days is blogging. Well, perhaps not every VC. But the trend is certainly rising.So why are they taking up blogging? Ed Sim over at Beyond VC, a venture capitalist who invests in early information technology businesses, says one of his main reasons for blogging is to keep up on hot topics of the day to understand what the early adopters are thinking.Blogs are a great medium for tracking trends. They offer immediacy and a wide range of opinions.