Google AdWords Ad Auctions Insights lets users run a report (only for individual keywords at the moment) and view half a dozen metrics against other advertisers. These include impression share, verge position, overlap rate, position above rate and top of page percentage.
MSN Adcenter Improves Keyword Filtering
Adobe Ads Feather to It’s Internet Marketing Bow
Facebook’s Targeting Targeted by European Commission
Extend Your Ads +1s to your Site
Infographic: How the Adwords Auction Works
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