More acquisition news from the TechStars Demo Day: madKast will soon be acquired by ShareThis, a widget company that allows users to share a blog post or news article across multiple services like Digg and MySpace. madKast, which we covered last October, is also a widgetmaker, allowing users to share posts through web services as well as through other routes like SMS messages and email.

Details of the upcoming acquisition are scant at this point, as madKast is currently unable to disclose any further information (the deal will not be complete for a few days). ShareThis, which closed a $15 million round last March, is likely looking to acquire madKast both for its complementary technology and its team.

Earlier today IntenseDebate, another TechStars company, announced that it had been acquired by Automattic, the company behind WordPress.