Don't log in, or when done log out if you're concerned about it. Alternatively use your browser's incognito or private browsing mode.
According to their newly clarified privacy policy, by default when you've logged in they do a lot if tracking and the different parts of their company share information. You can turn a lot of it off in the privacy settings.
According to the same privacy policy, they track virtually nothing if you're not logged in and nothing if you use private mode.
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