Even though one second isn’t that much in an ordinary world,
a lot of stuff happens on the Internet in 1 second.
Please note that most of these numbers are not based on official company tallies.
Many of them are estimate and should not be taken as 100% accurate.
Some sources & further reading:
http://www.internetlivestats.com/one-second/
https://www.omnicoreagency.com/facebook-statistics/
http://expandedramblings.com/index.php/reddit-stats/