Right, here's what someone on the net can get from your IP.
When you're on there website they can get your Computer information, like your operating system, Windows version and a list of hardware in your Computer, after that they can trace the IP to your ISP.
If they want more information, they could try to hack your ISP but this is very difficult to achieve (but not impossible), once they have got this far they then could get your account/personal information, But......... most ISP's don't have personal information accessable from the internet, the ISP I work for uses internal VPN and a seperate subnet which isn't visable from the internet accessable LAN or WAN, also any access to customer personal information requires the users username/password and the Computer is traced on the network and a log of the access is made, if the trace isn't from the Computer listed to that username/password the access is denied.
So to answer your question, yes and no...But highly unlikely.
BullDog(UK)