They were used to link lots of bits of data for which we no longer use them because they provide nothing of any value but require access to the Perl code more than is necessary.
We stopped using them several years ago for anything other linking comments and moderations to stories and accounts.
Proof of your lies [soylentnews.org].
You use them to track people like aristarchus.
FatPhil is an IT professional, used to work for Nokia, in Finnsland! He would never help janrinok dox a AC, because that would be wrong. As he has asserted many times to janrinok, who refused to listen.