eBay just sold StumbleUpon to its original founders and returns it with triple the registered users or about 7.5 million. The site was sold to eBay in May of 2007 for $75 million and eBay has recently said the site has little synergy with its core business. Why is this important? Simply because the same comments were made about Skype and rumors are flying that Skype too will be sold. Certainly the Stumbleupon sale makes it more likely that eBay will unload all non-core holdings which means Skype could be sold this year as well.