Google Webmasters tools enables sharing
Google added the site verification tool to Webmaster Tools. So now there is no need to upload several html files so everyone can have access to a specific account. All it takes is to add the email address, although it must be a gmail address. Of course, Google would not have it any other way..
Once you’re a verified owner of a website, you can view the Verification Details page (linked from Webmaster Tools or the Verification home page). That page will show you information about the site as well as a list of any other verified owners. At the bottom of the list of owners, you’ll now see a button labeled “Add a user…”. Click that, enter the user’s email address, and that person will instantly become a verified owner for the site! You can remove that ownership at any time by clicking the “Unverify” link next to the person’s email address on the Details page.
There are a few important things to keep in mind as you use this feature. First, each site must always have at least one owner who has verified directly (via meta tag or HTML file). If all of the directly verified owners become unverified, the delegated owners may also become unverified. Second, you can only delegate ownership to people with Google Accounts. Finally, remember that anyone you delegate ownership to will have exactly the same access you have. They can delegate to more people, submit URL Removal requests and manage Sitelinks in Webmaster Tools, etc. Only delegate ownership to people you trust!
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