folksonomy <p>a collection of terms allocated to
resources by users in order to categorise or index them in
a way that the users consider useful
</p>
<div class="note">
Terms in folksonomies, often called <strong><em>tags</em></strong>, are
typically added in an uncontrolled manner, without any
underlying structure or principles. They may be
idiosyncratic, but may also use current terminology more
quickly than it can be incorporated into a controlled and
structured scheme.
</div>