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PayPal plans an ad network built off your purchase history
(www.theregister.com)
This is a most excellent place for technology news and articles.
If only it was smart enough. Make its like oh you bought a newtv, you would like this new surround system
That would be actually valuable for consumers and advertisers. Shame its impossible.
The "people usually both this with this product" suggestions can be pretty good to cover this.