Foursquare, a US-based location-based application, has raised $41m in convertible debt from a consortium including media group O’Reilly’s corporate venturing unit.

Private equity firm Silver Lake Partners led the financing from its Waterman growth debt fund with O’Reilly AlphaTech Ventures (OATV) and venture capital firms Andreessen Horowitz, Union Square Ventures and Spark Capital providing the convertible element.

In June 2011, Foursquare raised $50m in its series C round at a reported $600m valuation, according to various news providers including TechCrunch.

The company had already raised $20m from a series B round in June 2010 also led by Andreessen Horowitz, and featuring involvement by OATV and Union Square. Union Square had previously led a $1.35m round of series A funding in September 2009. The series C investment took the overall equity amount to $71.35m over the three rounds.

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