When we are thinking about data in the federation we are talking about people curating there own data sets by embedding Live Data or Static Data as JSON Data Objects into one of their Federated Wiki Pages.
This data can then be used by other people in the federation. They can refer to this data easily by linking or forking a page, and then use their own site to create their own processing or visualisation of this data.
This is an interface or form of Social Architecture for Linked Data.
More than a million people have now used our Wolfram|Alpha Personal Analytics for Facebook. And as part of our latest update, in addition to collecting some anonymized statistics, we launched a Data Donor program that allows people to contribute detailed data to us for research purposes - blog.stephenwolfram.com 
The Wolfram Language is a general multi-paradigm programming language developed by Wolfram Research, that serves as the main interfacing language for Mathematica and the Wolfram Programming Cloud - wikipedia