Question Author
ChuckFickens - what I meant by that, is that I'd have thought facebook might have access to the relevant information to be able to identify convicted sex offenders with some information requested. ie, I can give them a name, an address and a case reference number, which I would have thought would take them to the relevant 'bit' in the sex offenders register.
However, it won't even let me proceed and submit the report form without either a link to the information I posted in my original post, or documentation. So I can't even put forward that I DO know but I don't have the docs.. does that make sense?
Ummmm - I think big websites such as facebook can trace users via their ISP or.. some number thingy which links to your interwebz connection, and PC's which you've logged onto the site via, so if they were to sign up as a different user, it would still link back to their PC.
I've just called the police, the contact centre have taken down loads of info and are going to get in touch with the police that were initially involved in the case and then they'll either get in touch with me for more info, or will go straight to facebook.
HORRAH! Thank you everyone :) Useful post for others who are looking for this info too - CALL THE POLICE!