When you advertise on adsense what data does google give you to help determine what websites are more suitable?

[Philip Catt]

Eg: Do you get any stats such as level of traffic, who visits the site (demographics, locality, interest) etc. Plenty of fish are a premium adsense advertiser attractor. Level of traffic alone does not justify expense though unless you have a mass market product. How do advertisers evaluate this against other high traffic sites ? Facebook provides advertisers with a lot of data to enable segmentation in all sorts of ways. Does adsense do the same ? If so how ?