A spat that erupted last week between eBay Inc. and Google Inc. after Google tried to siphon attention from the online auctioneer’s grand user celebration might presage more tension in one of the Internet’s most interesting new rivalries.

EBay and Google have been close partners. Google feeds the text ads that appear on eBay’s international sites (Yahoo Inc. handles that for eBay’s U.S. site). And the companies have been working on integrating aspects of the Google Talk voice-messaging software and the eBay-owned Skype Internet calling service.