If you like data you we will find Swivel, a quite curious service. It allows registered users to upload their own data sets in CSV format, obtained from a web page, from excel sheets or even from pdf files, and the site will generate all sorts of graphs for this data.
You can make the data public that the rest of users are now who can embed the graphs in their web pages thanks to the facilitated code, to leave comments, to value them, to edit some options, and the most interesting feature, to make comparisons with other graphs and run correlation analysis between different variables.
Some really weird correlations are being established in the site (global warming fits almost everything that goes up).
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