Facebook at times appears to be doing something similar. After spending a day in a conference room with a colleague that normally works from a different location, all of a sudden he was at the top of my "suggested friends" list.
I had a great one like this with LinkedIn recently - a client called me to discuss something and mentioned a third-party; I hadn't heard of them so asked if the client could send me some information; he sent me an email later that day with a link to the other company's web site, which I duly clicked and browsed around. The very next day, in my LinkedIn "People you may know" in the top row was a lead developer at that very same (tiny, otherwise totally unconnected to me) company.
We used the same temporal colocation analysis to find ships smuggling things at sea. ;)
Who is "we?" :)
It was one of many DARPA projects to see what can be done with the table scraps of open/unclassified data available. The ship beaconing data was in that category. As was uber sample data, backpage data, darkweb ecommerce, blockchain ledgers. We looked at ALL kinds of data, and tried fusing where we could. One target was human trafficking. https://www.google.com/search?q=memex+human+trafficking