Nate said:
Pierre, had a repair person or cleaning person person in your apartment lately? Stealth cameras are quite small and unobtrusive. Do you share walls with another apartment? Does your keyboard emit any kind of electromagnetic signal? Do photographs with your face unaccountably appear on on the internet? Are you becoming paranoid yet?
Yes to the last two questions
They're coming to take me away! HEEEEELP!
My apartment does share a wall with another, but that wall is load-bearing and quite thick (they knew how to build, 3 centuries ago
); as for EM noise from the keyboard, it's a possibility, of course, but it happens that my keyboard has a metallic frame, and is grounded through the USB connector…