We can vote on advertisements in Stack Overflow, but what happen when we vote on an advert?
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Oh my.. you have been chosen!
In short, it's a new feature that is still under development where users will be able to rate advertisements. (Note: only Careers "internal" advertisements, it's part of the Careers project)
The votes are obviously stored and this will give the team and probably the advertisers powerful tools to see how they're doing.