Tor is NOT a content filter - it does not block cookies, Javascript, Flash, or any other nefarious elements in web pages that may be used to identify and track you. This is why sniffing traffic on Tor exit nodes reveals plain text emails and passwords - the traffic is in the clear. Tor is NOT an encryption tool - your traffic is not encrypted by Tor. One hacker demonstrated this by sniffing emails and passwords from a Tor exit node. And the primary people with resources to run Tor exit nodes are state entities.
But if you're sending your personal details inside of unencrypted traffic (like your email, or communications), your traffic will be sniffable from the Tor exit node. At that point, Tor has served its purpose: the traffic's original source cannot be identified. Tor does nothing to protect your traffic once it leaves the Tor exit node. Finally, Tor passes the traffic to an exit node, which is where your traffic enters the "normal" web again.
It is then passed to a Tor bridge node, also randomly chosen. Tor uses three steps to anonymize the origin of traffic: first, the traffic is passed into a Tor entry node, which is randomly selected. It anonymizes the origin of your traffic by passing it through multiple relays.
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