"According to Wikipedia, Flash cookies are readable only by
their originating sites, and are not shared across domains. And yet
they are called "Local shared objects." HTTP cookies are commonly
abused by sharing across domains via third-party ad servers and in
concert with Web bugs, and that is how they build detailed profiles
of site visitors. If you enter personal data on one site, it is
possible for that data to be shared with other sites, and then they
know who you are. We're all familiar with the tired old "Oh we
don't collect personal data on purpose, and even when it's
accidental we don't look at it. It's all aggregated and anonymized!
No, really!" bushwah. Uh huh. Open up your servers and let us see,
because "trust but verify" is what wise people do."