Google Analytics Data Sharing

Google Analytics Data Sharing
Site stats program Google Analytics offers a new opt-in data sharing setting. Log-in and you’ll see a message dialog, and somewhere below it a link reading “Edit Account and Data Sharing Settings”. That link takes you to the settings page (see screenshot), where you can agree to share your traffic data...
“With Google products only”: Google says this will enable advanced advertisement services and improvements with other Google products. As an example use case, Google says you would be able to use an enhanced version of the AdWords conversion optimizer, once available.
“Anonymously with Google products and the benchmarking service”: When you check this option, Google say they will enable benchmarking* by sharing your data in anonymous form and improve services. All your traffic data will be non-site identifiable, and combined with other anonymous sites which are aggregated. Here, a use-case is to gain a broader context to understand where your site is placed in terms of traffic from related sites.
Not sharing your data with other Google products at all is also an option. If you do decide to opt-in, data from up to a month before will be shared; opting out will stop data-sharing on that day, according to Google. Google at their data sharing FAQ prints the following teaser to convince you to allow them to do more with your site data:
Shared data will be used to improve the services we provide you and will help create more powerful features for you to choose from. As they become available, only those who share their data with Google will gain access to these services and features. [Upcoming releases] will offer greater insight and flexibility to the customers who have opted to share their data.