Here is a list of the cookies we have defined as 'strictly necessary':
ASP.NET_SessionId - contains a unique and anonymous identifying ID, which allows us to ensure that subsequent visits to our website are recorded as belonging to the same (unique) visitor. This cookie expires after you leave our website.
__bsscookieLevel - contains information about which cookie setting the visitor has selected. This cookie expires in 30 days and does not contain any identifying information.
__bssstyle - remembers which stylesheet you had previously selected. This is important for accessibility reasons, as we want to provide our users the best experience. This cookie expires in 30 days and does not contain any identifying information.
__bsstabs - remembers which section of the promotional carousel you last looked at and sets it as default on your next visit. This cookie expires in 30 days and does not contain any identifying information.
visitor_info1_live and pref - are set by youtube.com and identify which version of Flash plugin is installed to ensure that the best video performance is delivered and that a new YouTube interface is loaded. These cookies do not contain any identifying information.
__bssbof - enables visitors to hide and show the content carousel. It remembers the setting upon the next visit and displays the toggle switch. This cookie expires in 30 days and does not contain any identifying information.
__bssflakesremoved - contains information which flake from the has been removed from the homepage. This cookie expires in 30 days and does not contain any identifying information.
__bssflakesadded - contains information which flake from the has been removed from the homepage. This cookie expires in 30 days and does not contain any identifying information.
We use Google Analytics, which creates a number of first-party cookies, all prefixed __utm:
__utma: contains a unique and anonymous identifying ID, which allows us to ensure that subsequent visits to our website are recorded as belonging to the same (unique) visitor. This cookie expires after two years.
__utmb: used to establish and continue a unique user session. Each time you request another page from the website the cookie is updated to expire after 30minutes.
__utmc: works with __utmb to determine when to create a new session for a website visitor. This is a session cookie and expires when you exit the browser.
__utmz: tracks how you found us and is used to calculate traffic and navigation within the website. It is updated with every new page view and expires after 6 months.
To opt out of our use of Google Analytics you may wish to consider using the Google Analytics Opt-out Browser Add-on(http://tools.google.com/dlpage/gaoptout).
psc - View counter cookie via addthis.com
uid/uit - User id and login time tracking via addthis.com
_atuvc - is created and read by addthis.com JavaScript on the client side in order to make sure the user sees the updated count if they share a page and return to it before our share count cache is updated. No data from that cookie is sent back to AddThis.