*Amazon says its Kindle devices had biggest sales day ever. *ChannelAdvisor says client sales growth stronger on eBay than Amazon. Still, eBay Inc, operator of one of the largest online marketplaces, outperformed its arch rival Amazon.com over the crucial first five days of the holiday shopping season, according to one closely watched measure.
Sales on eBay Inc's online marketplace were particularly strong and Amazon.com Inc continued its rapid holiday shopping season growth, according to early Cyber Monday data released by e-commerce firm ChannelAdvisor. EBay's shares climbed about 5 percent to $51.50, a new multi-year high, in afternoon trading. Amazon's shares gained 1 percent to $242.26.
SAN FRANCISCO, Nov 25- Black Friday retail sales online topped $1 billion for the first time this year as more consumers used the Internet do their holiday shopping, comScore Inc said on Sunday.