Rather than start a new thread.
Had a strange/interesting one today - was out in town for a few appointments (so had my phone off) and then went into Vision Express in our local Tesco for an eye test - while waiting briefly interacted with one of the girls working in Tesco. Just now had her pop up as someone I might know on Facebook - no friends of friends, etc. and the only thing that could possibly tie me to that location would have been my card payment for the eye test (or some conspiracy level thing with facial recognition hah). Very very unlikely she knew my name even if she had any interest in looking me up.
Very strange coincidence.
It happened to me, too. It is not a coincidence. My guess is that there are cameras out there which detect you and then send data to facebook.
If not other electronic devices...
I also think it is possible they use satellites to spy us all.