I do not want to change this into a soc.culture.nordic or alt.asatru but .....

>in scandinavian mythology,TROLLS are creatures who look like ugly
>people. they live in or on mountains and steal children.

As an avid collector of Nordic mythology I find this to be rather
inaccurate definition... bollocks in fact, and would indeed be very
interested in meeting a mountain dwelling Danish Troll for instance,
given that the place is completely flat.....

And trolls are not always ugly (esp. in Ice. myths)

What draws together the (very different) versions of trolls across the
Nordic countries is the behaviour .... they are overly aggressive and
driven by their own feelings and desires, self centred and take no
notice of the needs or wishes of those around them, including their own
families (in most cases) ...

I find the naming of annoying Netziens as trolls to be entirely appropriate.