Where's the data?! Just calling Pareto's rule on every new phenomena does not work. Asking us to agree or disagree on something that none of us really has any data on is beyond pointless and actually harmful.

For instance, Yahoo data with Flickr shows that less than 10% of people actually contribute content. So Pareto's rule does not apply there. But only Facebook knows how it works with their users. You can't just blindly apply these "laws" to various user groups and expect them to be even half true.