"Also, ad-targeting is often a realtime problem."
Surely Google are caching a queue of adds for each user and similarly for "random unknown user"? Why would this have to be real time?
Surely Google are caching a queue of adds for each user and similarly for "random unknown user"? Why would this have to be real time?
Also advertisers often want to do dynamic stuff too. Or may be willing to pay more for the same user in different contexts. Or utterly unwilling to have their ad on sites with UGC. And you don't know where the user will show up next.