Louis says that cookies or tokens are a violation of privacy. Leo says they're pretty benign, though. The cookie only exists to allow him to keep from logging in to a site every time he visits. It reads the token and knows who he is. He could turn them off or prevent third party cookies. The browser leaks enough information about him to identify him, though. He could surf privately and delete all of his cookies, but even with all that, his ISP knows everything he does online. So if he really wants to be anonymous, he'd have to pretty much give up being online.