I imagined so too, but what were they basing this match on? The people they were suggesting did not, or at least should not, have had this particular email addr

I imagined so too, but what were they basing this match on? The people they were suggesting did not, or at least should not, have had this particular email address since it was created after I had worked with them. They only ever emailed (for group meetups/drinks) on my "personal" email address. Now I can recommendations for other people in the same company, previous colleagues who were at the same company at the same time, "friends of friends" and all that makes sense. But creepy as you say. Maybe the guys who wrote the algorithm now work for the NSA...