Investors, startups: Here's what you need to know about native ads

Most, if not all, major platforms on the web - Google, Facebook, YouTube, Twitter, Tumblr, and WordPress - have universally adopted "native" advertising formats, and billions of dollars are now being spent through Promoted Tweets on Twitter, Sponsored Stories on Facebook, Paid Discovery on StumbleUpon and Promoted Videos on WordPress blogs, among many others.

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