If you have an Android phone, Google tracks your location (GPS, cell towers and maps-wardriving-provided Wifi hotspots at least), so it's probably easy to see w

If you have an Android phone, Google tracks your location (GPS, cell towers and maps-wardriving-provided Wifi hotspots at least), so it's probably easy to see who met who. Maybe they also save seen bluetooth devices. Phones don't record conversations in the pocket by default yet, but it's not inconceivable when computing efficiency improves that recording is always on, and keyword data is saved by default. Handy if it can creates calendar markings from verbal agreements... And with Glass, video too. So meeting in person is getting less secure as well.