Kaggle is a platform for data prediction competitions. Companies, organizations and researchers post their data and have it scrutinized by the world's best statisticians.
S. Feng, L. Zhang, B. Li, D. Wang, G. Yu, and K. Wong. Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing, Seattle, Washington, USA, Association for Computational Linguistics, (October 2013)
F. Mitzlaff, M. Atzmueller, D. Benz, A. Hotho, and G. Stumme. Analysis of Social Media and Ubiquitous Data, volume 6904 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2011)