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Re:Ffffound is shutting down by icc97 on Wednesday April 26, 2017 @07:25PM (#14207929)
You could also ask what happend in Nov 2011 that stopped the exponential increase
Re:Ffffound is shutting down by conesus on Wednesday April 26, 2017 @10:29PM (#14208758)
That was the month they got rid of sharing and encouraged Reader users to share through Google+. It also inspired this tweet, which I remember fondly.

https://twitter.com/jkottke/status/131434505947979776

    Looking like @newsblur is the @pinboard of Google's deliciousing of Reader.
    1 Nov 2011, @jkottke