@aral "Facebook tinkered with users’ feeds for a massive psychology experiment" http://www.avclub.com/article/facebook-tinkered-users-feeds-massive-psychology-e-206324 …
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Replying to @mindcrash
Cyriel Retweeted Cyriel
@aral My somewhat longer version:https://twitter.com/mindcrash/status/482816348167630848 …Cyriel added,
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