What are Cookies:
"Cookies - small pieces of textual information sent by a web server and stored on the user's site (usually on the hard disc). The default parameters of cookies allow information that is contained in them to be read only by the server that created them. Cookies are usually used for counters, probes, online stores, sites that require logging in, advertisements, and to monitor the activity of visitors. "
Yes, we use. These are the cookies from Google Analytics, Google AdWords, Inspectlet, Mixpanel, twitter.com, Facebook.com, YouTube.com, Slideshare.net, Olark.
How to change browser settings:
Chrome: Manage your cookies and site data
Firefox: Enable or disable cookies
Internet Explorer: Remove and manage cookies
Safari: Manage Cookies
Lynx: Cookie handling when using the Lynx browser