Correction: WPP, Not GroupM, Invested In AppNexus

The March 9 edition of RTBlog ("Trolling For Transparency, Media's Latest Buzzword") incorrectly referred to WPP’s GroupM as being an investor in AppNexus. WPP invested in AppNexus as part of an asset exchange that includes parts of 24/7 Real Media. The column also incorrectly referred to AppNexus as …

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