I define it as *labor* ( inviting friends, adding people to my network, clicking on stuff ) and there is a mark-up language for it written @erdogan and @arikan called User Labor Mark-up Language ( ULML );

“…The recent trends in participatory web indicate that the spectacle users create in social web services ( through creating social content and meta-content) is not a by-product of use, but the product itself. Many web services today base their business models on capitalizing on this product, the creative capacity of their users, through sophisticated advertising networks while positioning the user as both the producer and the consumer of content. The service cycle is familiar: service provider facilitates social use, user produces content, content generates traffic, traffic attracts advertising revenue for the service.”

userlabor.org

[...] I am sure an enterprising mathematician will come along and put these metrics to some sort of use (Brian Caldwell?) perhaps a Golden Twitter Ratio so we don’t blow out our neocortex before quantum computing [...]