There might even be a nodding of heads when the breadth of what's held is explained: every joke cracked, birthday message posted and person "poked" remains logged on the site for posterity. It makes sense after all.
But few realise how much a fraudster could do within minutes of access to an account. A few simple searches could bring enough information to help a criminal open a credit card, loan or new bank account in your name. How? And who is to blame?
Anyone can download all the data Facebook holds on them. Thanks to Europe-wide data protection rules companies are obliged to reveal what information they store on you. Normally this involves a written request, small fee and 40-day wait.
Luckily Facebook makes this easy. By clicking on account settings (the small cog icon at the top right), picking "general" and going to "download a copy of your Facebook data" you can get hold of everything.