The History of SEO by @SlideShareHubSpot on @SlideShareslideshare #hubspot #inboundmarketing http://www.slideshare.net/HubSpot/hub-spot-historyofseocoffeetips
Source
https://twitter.com/danielmcclure/status/366160855605321729
https://twitter.com/danielmcclure/status/366160855605321729