user323: Bitcoins can be easily used to scam people out of their money due to the inability to perform charge-backs. What are the most notable cases of Bitcoin scams that are known?

user2526: If you look at a graph of the value of 1 bitcoin, that huge spike and drop was caused by someone hacking Mt.Gox and selling everyone's bitcoins to him/her for $0.00, dropping down the value to $0, and it stayed low as more people sold their bitcoins to make sure it wouldn't happen to them. It's been slowly rising since then.

user91542: Here all famous scammers/sites: 
List of Known Bitcoin Scams: Beware of Fraudsters!
Bitcoin Scammers list

user1378: Here's a list of the most notable scams, thefts, and hacks:
https://bitcointalk.org/index.php?topic=83794

323: <p>Bitcoins can be easily used to scam people out of their money due to the inability to perform charge-backs. What are the most notable cases of Bitcoin scams that are known?</p>
 2526: <p>If you look at a graph of the value of 1 bitcoin, that huge spike and drop was caused by someone hacking Mt.Gox and selling everyone's bitcoins to him/her for $0.00, dropping down the value to $0, and it stayed low as more people sold their bitcoins to make sure it wouldn't happen to them. It's been slowly rising since then.</p>
 91542: <p>Here all famous scammers/sites: </p>

<p><a href="https://medium.com/cryptopay/list-of-known-bitcoin-scams-beware-of-fraudsters-de8f7442acd0" rel="noreferrer">List of Known Bitcoin Scams: Beware of Fraudsters!</a></p>

<p><a href="https://www.cryptocoinsrevolution.com/bitcoin-scammers-list.php#.XESVhBjhV-E" rel="noreferrer">Bitcoin Scammers list</a></p>
 1378: <p>Here's a list of the most notable scams, thefts, and hacks:
<a href="https://bitcointalk.org/index.php?topic=83794" rel="noreferrer">https://bitcointalk.org/index.php?topic=83794</a></p>
