According to various rumors today, eBay is trying to sell the popular recommendation engine StumbleUpon , which eBay bought for $75 million in early 2007. It was never clear to us why eBay bought StumbleUpon in the first place. When the acquisition was first announced, we speculated that eBay would use StumbleUpon’s technology to create a new, viral way of shopping. In the end, though, …
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