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• Hubspot : http://www.slideshare.net/HubSpot/hs-facebook-slidesharev05?qid=acfb0922-
f830-4a5b-9276-b25e4adf37d0&v=qf1&b=&from_search=1
• Simply measured: http://www.slideshare.net/simplymeasured/a-complete-history-of-
facebook-adsso-far?qid=2cc27566-ca8c-4327-9d46-
13814c6e2eb4&v=qf1&b=&from_search=1
• Youtube turns eight: https://www.pinterest.com/pin/188729040609138742/
• Witter guide 2014: http://www.slideshare.net/mmahdy21/witter-guide2014final-1