Our tracking code sets a number of cookies for various purposes:

1) To better identify unique and/or "logged in" visitors.

2) To make tracking more efficient by using cookies as a temporary cache.

3) To lessen bandwidth and resources used by free and inactive accounts.

4) For better long term attribution of referrers and campaigns.

The full list of cookies we set along with what they do is available on our privacy policy, under the "Cookies" section.