Indianapolis e-mail marketing firm ExactTarget, sitting rich on a huge $70 million funding it did mid last year, has made its first move beyond e-mail, so to speak: it has acquired enterprise Twitter client CoTweet, for an undisclosed sum, according to separate notes posted on CoTweet’s and ExactTarget’s company blogs. The rationale is simple, complete with hyperbole: “The combined companies will offer the first complete solution for businesses to manage all aspects of their online communication with customers and prospects, including email, mobile, and social media”

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CoTweet will continue to operate in San Francisco and establish a new “Social Media Lab” for ExactTarget. It had raised about $1.1 million in funding last year from Baseline Ventures, Founders Fund, First Round Capital, SV Angel, Maples Investments, and Freestyle Capital.