It depends on the context you are using it in! For social news (e.g. reddit et al.), this sort of thing might be a great help at providing personal recommendati

It depends on the context you are using it in! For social news (e.g. reddit et al.), this sort of thing might be a great help at providing personal recommendations. Here is a fun recent paper from google, about 'Scalable Online Collaborative Filtering' for their personalised news service [http://www2007.org/paper570.php http://www2007.org/paper570.php], using MapReduce to run Expectation Maximization. via [http://www.datawrangling.com/google-paper-on-parallel-em-algorithm-using-mapreduce.html http://www.datawrangling.com/google-paper-on-parallel-em-alg...]