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CTR is the ratio which tells that how many times your site link has been clicked for a particular add impression you are doing optimization.It is calculated by

CTR = (Clicks/Impressions) x 100...

You can get Alerts from Google everyday,weekly,monthly as you like.All you have to do is just signup with an account.

Social bookmarking gives the exposure to your site in the internet world and one can access the bookmarked site from anywhere in the world with just an access to the internet.It is much different...