[adpfr]

A couple of subreddits somehow relevant for machine learning and operations research [with a rough estimate of the number of subscribers]:

http://www.reddit.com/r/sysor/ [2650]

http://www.reddit.com/r/optimization/ [200]

http://www.reddit.com/r/algorithms/ [8960]

http://www.reddit.com/r/machinelearning/ [20000]

http://www.reddit.com/r/BusinessIntelligence/ [2100]

http://www.reddit.com/r/database/ [6700]

http://www.reddit.com/r/datasets/ [6900]

http://www.reddit.com/r/datascience/ [1800]

http://www.reddit.com/r/opendata/ [2800]

http://www.reddit.com/r/analyzit/ [200]

http://www.reddit.com/r/semanticweb/ [2600]

http://www.reddit.com/r/visualization/ [8600]

http://www.reddit.com/r/analytics/ [1600]

Edit: formatting

[pyk]

Ah, this was a surprise since OR doesn't appear all that often on HN -- and I haven't sub'd to quite a few of these. Thank you!