Echfon, which used to be called TwitterFon after its Twitter client, is used by 3 million people. The startup offers a Twitter app for the iPhone, a native Twitter clients, a Facebook app for the iPhone, and a Twitter iPad app.

PostUp, which was incubated by idealab, opened registration for its bidded marketplace for real-time search last year and along the way has acquired a number of Twitter clients. The startup recently bought Twitter Android client Twidroid and news aggregator service popurls. PostUp’s search algorithms and marketplace has been integrated on a number of sites, including here at TechCrunch, Topix.com, and Businessinsider.com.

PostUp plans to expand the features and functions of EchoFon and is a “natural complement” to the company’s Twitter app for Android phones, Twidroyd.

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Authors: Leena Rao

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