According to this picture from Uberfacts:
Our attention spans are less than that of a goldfish.
Did Microsoft actually make this claim? When?
Is there any valid evidence for this claim?
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Microsoft Canada did some research in the Spring of 2015 which resulted in the following report
It included this info graphic
The research is quite in-depth, specifying
This study breaks attention into three parts because we don’t think that attention can be simply characterized as how long people can concentrate —different tasks, devices, and lifestyles require different sets of attention types.
Those three parts are
The report itself is pretty fascinating, I suggest a read to make up your own mind as to whether this is "evidence".
These claims are the end of a long chain of poorly sourced chain.
The Uberfacts meme vaguely attributes the claim to "Microsoft".
Microsoft Canada does make the claim (Huge hat-tip to @JamieC), and vaguely attributes the claim to "Statistic brain"
Statistic Brain does make the claim:
The average attention span in 2015 8.25 seconds
The average attention span in 2000 12 seconds
The average attention span of a gold fish 9 seconds
They vaguely attribute it to "National Center for Biotechnology Information, U.S. National Library of Medicine, The Associated Press", where the trail runs cold.