Social Media Boosts Referral Traffic! Really?

And in the other hand a report from "Search Engine Land" says, integrating your website with Social Networking sites like Facebook increase referral traffic by 300%!!
So which one of these values is exact? Any thoughts?
PS: "Social Media Engagement" may not drive enough traffic but gets business!
Labels: Facebook, Google Analytics, Report, Social Media, Social Media Engagement, Traffic
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