__utma
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Google Analytics
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Used to distinguish users and sessions. The cookie is created when the javascript library executes and no existing __utma cookies exists. The cookie is updated every time data is sent to Google Analytics.
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__utmb
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Google Analytics
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Used to determine new sessions/visits. The cookie is created when the javascript library executes and no existing __utmb cookies exists. The cookie is updated every time data is sent to Google Analytics.
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__utmc
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Google Analytics
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Not used in ga.js. Set for interoperability with urchin.js. Historically, this cookie operated in conjunction with the __utmb cookie to determine whether the user was in a new session/visit.
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__utmt
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Google Analytics
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Used to throttle request rate.
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__utmz
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Google Analytics
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Stores the traffic source or campaign that explains how the user reached your site. The cookie is created when the javascript library executes and is updated every time data is sent to Google Analytics.
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__ga
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Google Analytics
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Used to distinguish users.
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2 jaar
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__gid
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Google Analytics
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Used to distinguish users.
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24 uur
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__zlcmid
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Zendesk (Zopim)
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ZenDesk (formerly Zopim) tracking
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