Why do you say that? It seems like an important thing to keep track of, for people who you don't keep in regular contact with. Prevents "Who the heck is Greg Bobberton?", if you can just look and see "Greg Bobberton: that guy from the Widgetpalooza conference, was interested in that one idea I had" (obviously with less vague specifics).
Why do you feel it would be a creepy feature?