To use this feature, you’ll need at least 15 conversion in the last 30 days, though you should really only use it if you have more historic conversions in order for AdWords to more accurately adjust your bids to meet the target. If you’re selling a product or service that is particularly seasonal, keep a close eye on your Cost per Conversion target to make sure that AdWords doesn’t reduce your bids too much if you have a period where conversions aren’t happening as much as they were during peak season.
Dmitry single-handedly grew a startup from zero to 40 million page views through PR & SEO and got acquired by Google. He has translated his know-how into an SEO and PR coaching program PRThatConverts and a 'PR on a shoestring' pitching service and software JustReachOut which is used by 4,000+ professionals and entrepreneurs to pitch relevant influencers and bloggers to get featured in press every single day. In his spare time he writes about SEO and PR on his blog CriminallyProlific.

Keyword Difficulty (KD). This is a cumulative score that shows you how difficult it will be to rank organically for this keyword. It accounts for the number of competitors within this space as well as the strength of those competitors. If one of your competitors is a government website that gets millions of visits each month, for instance, that will impact your difficulty score. Other factors that impact difficulty include the quality of content your competitors have and how relevant it is to the searcher.  As a best practice, look for keywords with a difficulty score that's no higher than 80.

Now the ad servers don’t create this table themselves, they license it from another ‎company like MaxMind or DigitalEnvoy, whose primary business is geolocation ‎data.   This is no enviable task; IP addresses themselves don’t necessarily have an ‎obvious pattern in the way they are assigned like a telephone area code would.  It’s ‎a bit like solving a mystery, and the geolocation companies use a variety of ‎methods to approach the problem.  ‎ /injects>
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