The latest "10 Concert" craze on Facebook is actually a way for hackers to get access to your personal information.
If you don't know what it is, it's where users of Facebook have been listing 10 different concerts in their status. One of which they HAVE NOT been to. They ask followers to guess which one they have not been to, and apparently hackers can use this as a way of cracking passwords.
Yet another reason why NOT to do the TRENDY thing on Facebook.