An example:
The topic of discussion is bitcoin's privacy and anonymity. A user asks if bitcoin is anonymous.
User A replies: Yes, bitcoin is an anonymous coin.
User B says: Bitcoin is only semi-anonymous. Your real name and private information isn't printed into the ledger and is not directly connected to the address you use, but if you connect that address to an exchange that has your real name, or other addresses which might lead back to you, it's possible to follow the money and perhaps discover your name.
User A was wrong in saying that bitcoin is anonymous. But he was partially right as well because your name, address, location, photograph, etc. isn't recorded on the blockchain. When users C and D read the thread, I think it gives them a more clearer picture to leave the reply of User A as well. They will be able to learn that bitcoin is anonymous, but not in the way that many people think it is.