* Treasury officials begin to tackle the dearth of small company IPOs

* Investors wait to see if Japanese earthquake triggers catastrophe bonds

* Henry Blodget: John Doerr, Twitter and the rise of secondary private markets

* Morning Call: U.S. futures point lower, London rises earlyEuropean shares slide and a massive sell-off in Japan.

* Rob Go: What sports produce the best entrepreneurs?

* Bill Aulet: AC/DC controversy of the 1880s applies to natural gas today

* It’s official: China becomes the world’s largest manufacturer (by output)

* 4chan founder: Mark Zuckerberg is “totally wrong” about online identity

* Twitter co-founder Jack Dorsey has been tweeting the company’s founding story

* Bloomberg: Dollar Tree DLTR is the best LBO bargain among the bargain retailers

* The Big Deal: Berkshire Hathaway agrees to buy Lubrizol LZ for $9 billion in cash. The $135 per share deal represents a 28% premium to Friday’s closing price.