eBay to purchase StumbleUpon

How come eBay buy all the cool sites on the internet, I though they were about selling? Skype is now the de facto VOIP on the net, miles ahead of the competition on quality and functionality, PayPal too. eBay buys these things at just the right moment, just before the network effect kicks in and crushes the competition. Clever that.

If you're lucky you could pick up some of my cool second hand junk on eBay (until 21:00 on Tues)