It may be getting harder for Facebook to stand out among other social sites for ad revenue, given the increasingly crowded space, but Adobe’s latest social media intelligence report for the first quarter of 2014 found that revenue referred from most social channels to retail sites dropped quarter-over-quarter, except for Facebook. Facebook’s referred revenue per visit rose 2 percent quarter-over-quarter, while Twitter and Tumblr’s figure declined by 23 percent and 36 percent respectively. Year-over-year though, Tumblr’s referred revenue per visit was up 55 percent, followed by Facebook at 11 percent and Twitter at 5 percent. Adobe noted in its report: “While Pinterest…

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