The list is in progress. Your suggestions are most welcome, and if you have any additions or corrections email me.

Description	Source	Information
Stanford Large Network Dataset Collection Contains Online Reviews datasets suitable for Senitment Ananalysis and text mining applications including data classification and clustering using machine learning.	https://snap.stanford.edu/data/ t	Large network Twitter and Memetracker : Memetracker phrases, links and 467 million Tweets Online communities : Data from online communities such as Reddit and Flickr Online reviews : Data from online review systems such as BeerAdvocate and Amazon SNAP networks are also available from SuiteSparse Matrix Collection by Tim Davis.