Marketing Day: Black Friday by the numbers, Tumblr CEO steps down & Facebook’s ad principles

Original Post: http://feeds.marketingland.com/~r/mktingland/~3/PruUIA0di78/marketing-day-black-friday-numbers-tumblr-ceo-steps-facebooks-ad-principles-229122

Here’s our recap of what happened in online marketing today, as reported on Marketing Land and other places across the web.

Please visit Marketing Land for the full article.

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