Google Analytics is a powerful tool that tracks and analyzes website traffic for informed marketing decisions.
Service URL: policies.google.com (opens in a new window)
_gac_
Contains information related to marketing campaigns of the user. These are shared with Google AdWords / Google Ads when the Google Ads and Google Analytics accounts are linked together.
90 days
__utma
ID used to identify users and sessions
2 years after last activity
__utmt
Used to monitor number of Google Analytics server requests
10 minutes
__utmb
Used to distinguish new sessions and visits. This cookie is set when the GA.js javascript library is loaded and there is no existing __utmb cookie. The cookie is updated every time data is sent to the Google Analytics server.
30 minutes after last activity
__utmc
Used only with old Urchin versions of Google Analytics and not with GA.js. Was used to distinguish between new sessions and visits at the end of a session.
End of session (browser)
__utmz
Contains information about the traffic source or campaign that directed user to the website. The cookie is set when the GA.js javascript is loaded and updated when data is sent to the Google Anaytics server
6 months after last activity
__utmv
Contains custom information set by the web developer via the _setCustomVar method in Google Analytics. This cookie is updated every time new data is sent to the Google Analytics server.
2 years after last activity
__utmx
Used to determine whether a user is included in an A / B or Multivariate test.
18 months
_ga
ID used to identify users
2 years
_gali
Used by Google Analytics to determine which links on a page are being clicked
30 seconds
_ga_
ID used to identify users
2 years
_gid
ID used to identify users for 24 hours after last activity
24 hours
_gat
Used to monitor number of Google Analytics server requests when using Google Tag Manager
1 minute
TheAltWorld 
Geoff Stewart
Suggest you check out ‘Gaggle Goggles’ (Amazon) for insight into the evolution and operation of gaggles.
‘In this refreshingly irreverent meditation, the author examines tribalism wherever he finds it—ants, street gangs, even bacteria—in order to rediscover what has been lost in “our experiment with notional freedom, enlightenment,” and an atomized society. Stewart makes some original and thought-provoking arguments. For example, he claims that street gangs are likely right to reject a “bourgeois conformist” lifestyle and refuse to pay taxes or “cringe before petty government officials.” —Kirkus Reviews
“This is not the typical academic study—Stewart’s eclectic, freewheeling style is closer to Guy Debord’s The Society of the Spectacle (1967) than to anything found in scholarly literature. This can make for rollicking good fun.” —Kirkus Reviews