Now, companies like Google, Yahoo and Microsoft let advertisers buy ads in the milliseconds between the time someone enters a site’s Web address and the moment the page appears. The technology, called real-time bidding, allows advertisers to examine site visitors one by one and bid to serve them ads almost instantly.
For example, say a man just searched for golf clubs on eBay (which has been testing a system from a company called AppNexus for more than a year). EBay can essentially follow that person’s activities in real time, deciding when and where to show him near-personalized ads for golf clubs throughout the Web.
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