But there are warnings that the recent Facebook craze could actually be a risk to our online security.
The first gig you went to is often one of the security questions which banks and other organisations ask when setting up an account - and revealing that information online, even in an innocent online post, could make you more vulnerable to hackers.
"I wouldn't do it," said Prof Alan Woodward, from the University of Surrey.
"But it's difficult to tell people not to take part, as it is part of their social interaction and has become the norm.
