The tubes were buzzing yesterday about Twitter’s new round of funding from Kleiner Perkins, whose $200 million dollar investment brings Twitter’s total valuation to around $3.7 billion. As someone who has been involved with VC investment before, I can tell you that while the valuation is very exciting, the hard part is this – finding the best way to spend that $200 million wisely. Longtime Twitter users will no doubt point to investments in infrastructure, data mining or development tools, but after looking at a year’s worth of statistics on Twitter, they have a more pressing need – acquiring users.