Social Networking Anti Patterns
microformats.org
microformats.org
At best, it'll become like opening zips and exe files. Users will have to become aware of the potential dangers, but the practice of providing the files will remain.
I'm currently researching the PCI DSS for my employer, and I'm seeing this as the next potential milestone in security compliance. It's not just a matter of the general public becoming aware of the risks, like they have with credit card info, the users of the data must set in place secure standards to deal with identity data.
another contender for this suspect behaviour, for reference