Looking to gain a foothold among younger users, Yahoo is shelling out $1 billion for the microblogging site Tumblr. CNET's Sumi Das explains the high valuation and how it will affect both buyer and ... more 
Looking to gain a foothold among younger users, Yahoo is shelling out $1 billion for the microblogging site Tumblr. CNET's Sumi Das explains the high valuation and how it will affect both buyer and seller. less 
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Mon, May 20, 2013 8:19 PM EDT