That link has your si in it. Your si is a tracking code Google uses to determine who clicked on links you shared. They want to know who your friends are for their social data models.
I had to explain this similar concept to a co-worker who always puts his tracking info in his parts orders. He didn't understand until I started asking him about firearms parts he had been browsing on his own Amazon account.
Hold on... how were you able to find out about his amazon browsing habits from a tracking code? I thought end-users wouldn't have that information but only amazon themselves (+ their 391712 friends).
The firearms parts he was viewing were suggested to me as things people you know are interested in. He talks about it all the time, so I have him a hard time on the patriotic-sounding names to the parts.
Okay so NASA lost a $327 million Mars probe because said was transmitting trajectory corrections in the SI Units of Newton-Seconds, but the home base software was interpreting and calculating it as Pound Seconds.
Remembering that there was endless amounts of scientific equipment aboard that took years to make, and the whole enchilada took 10 months traveling through space before it could even crash.