Mobile app marketing optimization service Liftoff says Blackstone Group has made an investment in the company; source: the amount is close to $400M (Laura Kreutzer/Wall Street Journal)

Laura Kreutzer / Wall Street Journal:

Mobile app marketing optimization service Liftoff says Blackstone Group has made an investment in the company; source: the amount is close to $400M  —  Liftoff Mobile uses machine learning to help app marketers improve and track performance  —  Blackstone Group Inc. is betting …

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